31107490091 has 2 divisors, whose sum is σ = 31107490092. Its totient is φ = 31107490090.

The previous prime is 31107490079. The next prime is 31107490153. The reversal of 31107490091 is 19009470113.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31107490091 - 2¹⁰ = 31107489067 is a prime.

It is not a weakly prime, because it can be changed into another prime (31107490031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15553745045 + 15553745046.

It is an arithmetic number, because the mean of its divisors is an integer number (15553745046).

Almost surely, 2^31107490091 is an apocalyptic number.

31107490091 is a deficient number, since it is larger than the sum of its proper divisors (1).

31107490091 is an equidigital number, since it uses as much as digits as its factorization.

31107490091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 35.

The spelling of 31107490091 in words is "thirty-one billion, one hundred seven million, four hundred ninety thousand, ninety-one".