12931155 has 24 divisors (see below), whose sum is σ = 22621248. Its totient is φ = 6832896.

The previous prime is 12931133. The next prime is 12931181. The reversal of 12931155 is 55113921.

12931155 is a nontrivial binomial coefficient, being equal to C(5086, 2).

It is not a de Polignac number, because 12931155 - 2⁶ = 12931091 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3814 + ... + 6356.

It is an arithmetic number, because the mean of its divisors is an integer number (942552).

Almost surely, 2^12931155 is an apocalyptic number.

12931155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12931155 is the 5085-th triangular number and also the 2543-rd hexagonal number.

12931155 is a deficient number, since it is larger than the sum of its proper divisors (9690093).

12931155 is a wasteful number, since it uses less digits than its factorization.

12931155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2667 (or 2664 counting only the distinct ones).

The product of its digits is 1350, while the sum is 27.

The square root of 12931155 is about 3595.9915183437. The cubic root of 12931155 is about 234.7176630392.

The spelling of 12931155 in words is "twelve million, nine hundred thirty-one thousand, one hundred fifty-five".