91660331 has 6 divisors (see below), whose sum is σ = 106625340. Its totient is φ = 78565956.

The previous prime is 91660321. The next prime is 91660337. The reversal of 91660331 is 13306619.

It is a de Polignac number, because none of the positive numbers 2^k-91660331 is a prime.

It is a super-2 number, since 2×91660331² = 16803232558059122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91660294 and 91660303.

It is not an unprimeable number, because it can be changed into a prime (91660337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 935261 + ... + 935358.

It is an arithmetic number, because the mean of its divisors is an integer number (17770890).

Almost surely, 2^91660331 is an apocalyptic number.

91660331 is a deficient number, since it is larger than the sum of its proper divisors (14965009).

91660331 is a wasteful number, since it uses less digits than its factorization.

91660331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1870633 (or 1870626 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 91660331 is about 9573.9402024454. The cubic root of 91660331 is about 450.8794833038.

The spelling of 91660331 in words is "ninety-one million, six hundred sixty thousand, three hundred thirty-one".