3131216652521 has 12 divisors (see below), whose sum is σ = 3235914048132. Its totient is φ = 3029804964000.

The previous prime is 3131216652463. The next prime is 3131216652527. The reversal of 3131216652521 is 1252566121313.

It can be written as a sum of positive squares in 2 ways, for example, as 2889609013225 + 241607639296 = 1699885^2 + 491536^2 .

It is not a de Polignac number, because 3131216652521 - 2¹⁸ = 3131216390377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3131216652527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7110011 + ... + 7537551.

It is an arithmetic number, because the mean of its divisors is an integer number (269659504011).

Almost surely, 2^{3131216652521} is an apocalyptic number.

3131216652521 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3131216652521 is a deficient number, since it is larger than the sum of its proper divisors (104697395611).

3131216652521 is an equidigital number, since it uses as much as digits as its factorization.

3131216652521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435224 (or 435193 counting only the distinct ones).

The product of its digits is 64800, while the sum is 38.

The spelling of 3131216652521 in words is "three trillion, one hundred thirty-one billion, two hundred sixteen million, six hundred fifty-two thousand, five hundred twenty-one".