31780960577 has 4 divisors (see below), whose sum is σ = 31875266436. Its totient is φ = 31686654720.

The previous prime is 31780960567. The next prime is 31780960579. The reversal of 31780960577 is 77506908713.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11628602896 + 20152357681 = 107836^2 + 141959^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31780960577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31780960579) 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, 47152424 + ... + 47153097.

It is an arithmetic number, because the mean of its divisors is an integer number (7968816609).

Almost surely, 2^31780960577 is an apocalyptic number.

It is an amenable number.

31780960577 is a deficient number, since it is larger than the sum of its proper divisors (94305859).

31780960577 is an equidigital number, since it uses as much as digits as its factorization.

31780960577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94305858.

The product of its (nonzero) digits is 2222640, while the sum is 53.

The spelling of 31780960577 in words is "thirty-one billion, seven hundred eighty million, nine hundred sixty thousand, five hundred seventy-seven".