31212515113 has 8 divisors (see below), whose sum is σ = 33991158600. Its totient is φ = 28487826048.

The previous prime is 31212515063. The next prime is 31212515161. The reversal of 31212515113 is 31151521213.

It can be written as a sum of positive squares in 4 ways, for example, as 1104365824 + 30108149289 = 33232^2 + 173517^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31212515113 - 2²⁹ = 30675644201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31212515513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13487398 + ... + 13489711.

It is an arithmetic number, because the mean of its divisors is an integer number (4248894825).

Almost surely, 2^31212515113 is an apocalyptic number.

It is an amenable number.

31212515113 is a deficient number, since it is larger than the sum of its proper divisors (2778643487).

31212515113 is a wasteful number, since it uses less digits than its factorization.

31212515113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26977211.

The product of its digits is 900, while the sum is 25.

The spelling of 31212515113 in words is "thirty-one billion, two hundred twelve million, five hundred fifteen thousand, one hundred thirteen".