31577152891 has 2 divisors, whose sum is σ = 31577152892. Its totient is φ = 31577152890.

The previous prime is 31577152799. The next prime is 31577152897. The reversal of 31577152891 is 19825177513.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31577152891 - 2²⁷ = 31442935163 is a prime.

It is not a weakly prime, because it can be changed into another prime (31577152897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15788576445 + 15788576446.

It is an arithmetic number, because the mean of its divisors is an integer number (15788576446).

Almost surely, 2^31577152891 is an apocalyptic number.

31577152891 is a deficient number, since it is larger than the sum of its proper divisors (1).

31577152891 is an equidigital number, since it uses as much as digits as its factorization.

31577152891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 529200, while the sum is 49.

The spelling of 31577152891 in words is "thirty-one billion, five hundred seventy-seven million, one hundred fifty-two thousand, eight hundred ninety-one".