31695604921 has 4 divisors (see below), whose sum is σ = 31696054272. Its totient is φ = 31695155572.

The previous prime is 31695604901. The next prime is 31695604961. The reversal of 31695604921 is 12940659613.

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 a de Polignac number, because none of the positive numbers 2^k-31695604921 is a prime.

It is a super-2 number, since 2×31695604921² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31695604901) 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 3 ways as a sum of consecutive naturals, for example, 93241 + ... + 268486.

It is an arithmetic number, because the mean of its divisors is an integer number (7924013568).

Almost surely, 2^31695604921 is an apocalyptic number.

It is an amenable number.

31695604921 is a deficient number, since it is larger than the sum of its proper divisors (449351).

31695604921 is an equidigital number, since it uses as much as digits as its factorization.

31695604921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449350.

The product of its (nonzero) digits is 349920, while the sum is 46.

The spelling of 31695604921 in words is "thirty-one billion, six hundred ninety-five million, six hundred four thousand, nine hundred twenty-one".