31349239091 has 2 divisors, whose sum is σ = 31349239092. Its totient is φ = 31349239090.

The previous prime is 31349239043. The next prime is 31349239157. The reversal of 31349239091 is 19093294313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31349239091 - 2⁶ = 31349239027 is a prime.

It is not a weakly prime, because it can be changed into another prime (31349239001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15674619545 + 15674619546.

It is an arithmetic number, because the mean of its divisors is an integer number (15674619546).

Almost surely, 2^31349239091 is an apocalyptic number.

31349239091 is a deficient number, since it is larger than the sum of its proper divisors (1).

31349239091 is an equidigital number, since it uses as much as digits as its factorization.

31349239091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 44.

The spelling of 31349239091 in words is "thirty-one billion, three hundred forty-nine million, two hundred thirty-nine thousand, ninety-one".