91415723 has 12 divisors (see below), whose sum is σ = 106580880. Its totient is φ = 78179472.

The previous prime is 91415711. The next prime is 91415729. The reversal of 91415723 is 32751419.

It is not a de Polignac number, because 91415723 - 2⁶ = 91415659 is a prime.

It is a super-2 number, since 2×91415723² = 16713668823225458, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91415723.

It is not an unprimeable number, because it can be changed into a prime (91415729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22793 + ... + 26501.

It is an arithmetic number, because the mean of its divisors is an integer number (8881740).

Almost surely, 2^91415723 is an apocalyptic number.

91415723 is a deficient number, since it is larger than the sum of its proper divisors (15165157).

91415723 is a wasteful number, since it uses less digits than its factorization.

91415723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4226 (or 4219 counting only the distinct ones).

The product of its digits is 7560, while the sum is 32.

The square root of 91415723 is about 9561.1569906576. The cubic root of 91415723 is about 450.4780483538.

The spelling of 91415723 in words is "ninety-one million, four hundred fifteen thousand, seven hundred twenty-three".