91764491 has 8 divisors (see below), whose sum is σ = 112941024. Its totient is φ = 72604800.

The previous prime is 91764469. The next prime is 91764493. The reversal of 91764491 is 19446719.

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

It is a cyclic number.

It is not a de Polignac number, because 91764491 - 2²² = 87570187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91764493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504110 + ... + 504291.

It is an arithmetic number, because the mean of its divisors is an integer number (14117628).

Almost surely, 2^91764491 is an apocalyptic number.

91764491 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

91764491 is a deficient number, since it is larger than the sum of its proper divisors (21176533).

91764491 is a wasteful number, since it uses less digits than its factorization.

91764491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008421.

The product of its digits is 54432, while the sum is 41.

The square root of 91764491 is about 9579.3784245117. The cubic root of 91764491 is about 451.0502072086.

The spelling of 91764491 in words is "ninety-one million, seven hundred sixty-four thousand, four hundred ninety-one".