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1331013031 = 2752748353
BaseRepresentation
bin100111101010101…
…1010010110100111
310102202112110121221
41033111122112213
510211214404111
6340024121211
744661265315
oct11725322647
93382473557
101331013031
1162335a877
12311906207
131829a609a
14c8ab50b5
157bcb9371
hex4f55a5a7

1331013031 has 4 divisors (see below), whose sum is σ = 1331088912. Its totient is φ = 1330937152.

The previous prime is 1331013017. The next prime is 1331013077. The reversal of 1331013031 is 1303101331.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1303101331 = 7186157333.

It is a cyclic number.

It is not a de Polignac number, because 1331013031 - 29 = 1331012519 is a prime.

It is a super-2 number, since 2×13310130312 = 3543191377383613922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331012996 and 1331013014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331013001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3351 + ... + 51703.

It is an arithmetic number, because the mean of its divisors is an integer number (332772228).

Almost surely, 21331013031 is an apocalyptic number.

1331013031 is a deficient number, since it is larger than the sum of its proper divisors (75881).

1331013031 is an equidigital number, since it uses as much as digits as its factorization.

1331013031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75880.

The product of its (nonzero) digits is 81, while the sum is 16.

The square root of 1331013031 is about 36483.0512841237. The cubic root of 1331013031 is about 1100.0035897954.

Adding to 1331013031 its reverse (1303101331), we get a palindrome (2634114362).

The spelling of 1331013031 in words is "one billion, three hundred thirty-one million, thirteen thousand, thirty-one".

Divisors: 1 27527 48353 1331013031