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31213031201231 = 1123251491520577
BaseRepresentation
bin1110001100011010110011…
…01000110001100111001111
311002111221021210220110222012
413012031121220301213033
513042343241441414411
6150215022451411435
76401032003440455
oct706153150614717
9132457253813865
1031213031201231
119a44410433540
123601364bb3b7b
1314554b77015c9
1479ca0c4429d5
15391dc8a2b18b
hex1c6359a319cf

31213031201231 has 16 divisors (see below), whose sum is σ = 35672597468928. Its totient is φ = 27033631680000.

The previous prime is 31213031201203. The next prime is 31213031201239. The reversal of 31213031201231 is 13210213031213.

Adding to 31213031201231 its reverse (13210213031213), we get a palindrome (44423244232444).

It is a de Polignac number, because none of the positive numbers 2k-31213031201231 is a prime.

It is a super-3 number, since 3×312130312012313 (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31213031201197 and 31213031201206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213031201239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245696786 + ... + 245823791.

It is an arithmetic number, because the mean of its divisors is an integer number (2229537341808).

Almost surely, 231213031201231 is an apocalyptic number.

31213031201231 is a deficient number, since it is larger than the sum of its proper divisors (4459566267697).

31213031201231 is a wasteful number, since it uses less digits than its factorization.

31213031201231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491520862.

The product of its (nonzero) digits is 648, while the sum is 23.

The spelling of 31213031201231 in words is "thirty-one trillion, two hundred thirteen billion, thirty-one million, two hundred one thousand, two hundred thirty-one".

Divisors: 1 11 23 251 253 2761 5773 63503 491520577 5406726347 11304973271 123371664827 124354705981 1357088313097 2837548291021 31213031201231