31368400865 has 8 divisors (see below), whose sum is σ = 37659103848. Its totient is φ = 25083372160.

The previous prime is 31368400859. The next prime is 31368400879. The reversal of 31368400865 is 56800486313.

It can be written as a sum of positive squares in 4 ways, for example, as 3134992081 + 28233408784 = 55991^2 + 168028^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31368400865 - 2¹⁶ = 31368335329 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1406396 + ... + 1428525.

It is an arithmetic number, because the mean of its divisors is an integer number (4707387981).

Almost surely, 2^31368400865 is an apocalyptic number.

It is an amenable number.

31368400865 is a deficient number, since it is larger than the sum of its proper divisors (6290702983).

31368400865 is a wasteful number, since it uses less digits than its factorization.

31368400865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2837139.

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 31368400865 in words is "thirty-one billion, three hundred sixty-eight million, four hundred thousand, eight hundred sixty-five".