31561000761505 has 8 divisors (see below), whose sum is σ = 38392011885672. Its totient is φ = 24902926627968.

The previous prime is 31561000761481. The next prime is 31561000761557. The reversal of 31561000761505 is 50516700016513.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8947086004224 + 22613914757281 = 2991168^2 + 4755409^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 31561000761505 - 2⁷ = 31561000761377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43234247254 + ... + 43234247983.

It is an arithmetic number, because the mean of its divisors is an integer number (4799001485709).

Almost surely, 2^{31561000761505} is an apocalyptic number.

It is an amenable number.

31561000761505 is a deficient number, since it is larger than the sum of its proper divisors (6831011124167).

31561000761505 is an equidigital number, since it uses as much as digits as its factorization.

31561000761505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86468495315.

The product of its (nonzero) digits is 94500, while the sum is 40.

The spelling of 31561000761505 in words is "thirty-one trillion, five hundred sixty-one billion, seven hundred sixty-one thousand, five hundred five".