91660131 has 12 divisors (see below), whose sum is σ = 132879552. Its totient is φ = 60884496.

The previous prime is 91660117. The next prime is 91660157. The reversal of 91660131 is 13106619.

It is not a de Polignac number, because 91660131 - 2⁶ = 91660067 is a prime.

It is a super-2 number, since 2×91660131² = 16803159229874322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91660095 and 91660104.

It is not an unprimeable number, because it can be changed into a prime (91660111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15891 + ... + 20876.

It is an arithmetic number, because the mean of its divisors is an integer number (11073296).

Almost surely, 2^91660131 is an apocalyptic number.

91660131 is a deficient number, since it is larger than the sum of its proper divisors (41219421).

91660131 is a wasteful number, since it uses less digits than its factorization.

91660131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37050 (or 37047 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 91660131 is about 9573.9297574194. The cubic root of 91660131 is about 450.8791553685.

The spelling of 91660131 in words is "ninety-one million, six hundred sixty thousand, one hundred thirty-one".