31813755674321 has 4 divisors (see below), whose sum is σ = 32024442798144. Its totient is φ = 31603068550500.

The previous prime is 31813755674303. The next prime is 31813755674329. The reversal of 31813755674321 is 12347655731813.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31813755674321 - 2²⁶ = 31813688565457 is a prime.

It is a super-2 number, since 2×31813755674321² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31813755674329) 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, 105343561685 + ... + 105343561986.

It is an arithmetic number, because the mean of its divisors is an integer number (8006110699536).

Almost surely, 2^{31813755674321} is an apocalyptic number.

It is an amenable number.

31813755674321 is a deficient number, since it is larger than the sum of its proper divisors (210687123823).

31813755674321 is a wasteful number, since it uses less digits than its factorization.

31813755674321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210687123822.

The product of its digits is 12700800, while the sum is 56.

The spelling of 31813755674321 in words is "thirty-one trillion, eight hundred thirteen billion, seven hundred fifty-five million, six hundred seventy-four thousand, three hundred twenty-one".