31688652091 has 2 divisors, whose sum is σ = 31688652092. Its totient is φ = 31688652090.

The previous prime is 31688652041. The next prime is 31688652133. The reversal of 31688652091 is 19025688613.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31688652091 - 2⁷ = 31688651963 is a prime.

It is not a weakly prime, because it can be changed into another prime (31688652041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15844326045 + 15844326046.

It is an arithmetic number, because the mean of its divisors is an integer number (15844326046).

Almost surely, 2^31688652091 is an apocalyptic number.

31688652091 is a deficient number, since it is larger than the sum of its proper divisors (1).

31688652091 is an equidigital number, since it uses as much as digits as its factorization.

31688652091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 31688652091 in words is "thirty-one billion, six hundred eighty-eight million, six hundred fifty-two thousand, ninety-one".