91945618 has 8 divisors (see below), whose sum is σ = 137959740. Its totient is φ = 45959040.

The previous prime is 91945603. The next prime is 91945643. The reversal of 91945618 is 81654919.

It can be written as a sum of positive squares in 2 ways, for example, as 88115769 + 3829849 = 9387^2 + 1957^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7338 + ... + 15418.

Almost surely, 2^91945618 is an apocalyptic number.

91945618 is a deficient number, since it is larger than the sum of its proper divisors (46014122).

91945618 is a wasteful number, since it uses less digits than its factorization.

91945618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13772.

The product of its digits is 77760, while the sum is 43.

The square root of 91945618 is about 9588.8277698580. The cubic root of 91945618 is about 451.3467768176.

The spelling of 91945618 in words is "ninety-one million, nine hundred forty-five thousand, six hundred eighteen".