31137538662961 has 4 divisors (see below), whose sum is σ = 31183128032112. Its totient is φ = 31091949293812.

The previous prime is 31137538662871. The next prime is 31137538662983. The reversal of 31137538662961 is 16926683573113.

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 31137538662961 - 2³⁵ = 31103178924593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31137538662961.

It is not an unprimeable number, because it can be changed into a prime (31137538662991) 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, 22794683551 + ... + 22794684916.

It is an arithmetic number, because the mean of its divisors is an integer number (7795782008028).

Almost surely, 2^{31137538662961} is an apocalyptic number.

It is an amenable number.

31137538662961 is a deficient number, since it is larger than the sum of its proper divisors (45589369151).

31137538662961 is an equidigital number, since it uses as much as digits as its factorization.

31137538662961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45589369150.

The product of its digits is 29393280, while the sum is 61.

The spelling of 31137538662961 in words is "thirty-one trillion, one hundred thirty-seven billion, five hundred thirty-eight million, six hundred sixty-two thousand, nine hundred sixty-one".