31502342561 has 2 divisors, whose sum is σ = 31502342562. Its totient is φ = 31502342560.

The previous prime is 31502342549. The next prime is 31502342563. The reversal of 31502342561 is 16524320513.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23396761600 + 8105580961 = 152960^2 + 90031^2 .

It is a cyclic number.

It is not a de Polignac number, because 31502342561 - 2²² = 31498148257 is a prime.

Together with 31502342563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31502342563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15751171280 + 15751171281.

It is an arithmetic number, because the mean of its divisors is an integer number (15751171281).

Almost surely, 2^31502342561 is an apocalyptic number.

It is an amenable number.

31502342561 is a deficient number, since it is larger than the sum of its proper divisors (1).

31502342561 is an equidigital number, since it uses as much as digits as its factorization.

31502342561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 32.

The spelling of 31502342561 in words is "thirty-one billion, five hundred two million, three hundred forty-two thousand, five hundred sixty-one".