91631713 has 2 divisors, whose sum is σ = 91631714. Its totient is φ = 91631712.

The previous prime is 91631681. The next prime is 91631741. The reversal of 91631713 is 31713619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55234624 + 36397089 = 7432^2 + 6033^2 .

It is a cyclic number.

It is not a de Polignac number, because 91631713 - 2⁵ = 91631681 is a prime.

It is not a weakly prime, because it can be changed into another prime (91631773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45815856 + 45815857.

It is an arithmetic number, because the mean of its divisors is an integer number (45815857).

Almost surely, 2^91631713 is an apocalyptic number.

It is an amenable number.

91631713 is a deficient number, since it is larger than the sum of its proper divisors (1).

91631713 is an equidigital number, since it uses as much as digits as its factorization.

91631713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3402, while the sum is 31.

The square root of 91631713 is about 9572.4455078104. The cubic root of 91631713 is about 450.8325541978.

The spelling of 91631713 in words is "ninety-one million, six hundred thirty-one thousand, seven hundred thirteen".