91640994 has 16 divisors (see below), whose sum is σ = 184497600. Its totient is φ = 30344400.

The previous prime is 91640981. The next prime is 91641007. The reversal of 91640994 is 49904619.

It is an interprime number because it is at equal distance from previous prime (91640981) and next prime (91641007).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 49669 + ... + 51480.

It is an arithmetic number, because the mean of its divisors is an integer number (11531100).

Almost surely, 2^91640994 is an apocalyptic number.

91640994 is an abundant number, since it is smaller than the sum of its proper divisors (92856606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91640994 is a wasteful number, since it uses less digits than its factorization.

91640994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101305.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 91640994 is about 9572.9302723879. The cubic root of 91640994 is about 450.8477746767.

The spelling of 91640994 in words is "ninety-one million, six hundred forty thousand, nine hundred ninety-four".