91302131 has 2 divisors, whose sum is σ = 91302132. Its totient is φ = 91302130.

The previous prime is 91302109. The next prime is 91302139. The reversal of 91302131 is 13120319.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91302131 - 2⁶ = 91302067 is a prime.

It is a super-2 number, since 2×91302131² = 16672158250282322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91302139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45651065 + 45651066.

It is an arithmetic number, because the mean of its divisors is an integer number (45651066).

Almost surely, 2^91302131 is an apocalyptic number.

91302131 is a deficient number, since it is larger than the sum of its proper divisors (1).

91302131 is an equidigital number, since it uses as much as digits as its factorization.

91302131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 91302131 is about 9555.2148589134. The cubic root of 91302131 is about 450.2913849436.

The spelling of 91302131 in words is "ninety-one million, three hundred two thousand, one hundred thirty-one".