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.

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

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

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".