91659031 has 2 divisors, whose sum is σ = 91659032. Its totient is φ = 91659030.

The previous prime is 91659013. The next prime is 91659041. The reversal of 91659031 is 13095619.

Together with previous prime (91659013) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91659031 - 2⁵ = 91658999 is a prime.

It is a super-2 number, since 2×91659031² = 16802755927717922, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 91659031 parts by 13539 straight cuts.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91659041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45829515 + 45829516.

It is an arithmetic number, because the mean of its divisors is an integer number (45829516).

Almost surely, 2^91659031 is an apocalyptic number.

91659031 is a deficient number, since it is larger than the sum of its proper divisors (1).

91659031 is an equidigital number, since it uses as much as digits as its factorization.

91659031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 91659031 is about 9573.8723095725. The cubic root of 91659031 is about 450.8773517161.

The spelling of 91659031 in words is "ninety-one million, six hundred fifty-nine thousand, thirty-one".