91115645 has 16 divisors (see below), whose sum is σ = 113985408. Its totient is φ = 69854400.

The previous prime is 91115623. The next prime is 91115669. The reversal of 91115645 is 54651119.

It is not a de Polignac number, because 91115645 - 2²⁶ = 24006781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8720 + ... + 16070.

It is an arithmetic number, because the mean of its divisors is an integer number (7124088).

Almost surely, 2^91115645 is an apocalyptic number.

It is an amenable number.

91115645 is a deficient number, since it is larger than the sum of its proper divisors (22869763).

91115645 is a wasteful number, since it uses less digits than its factorization.

91115645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7460.

The product of its digits is 5400, while the sum is 32.

The square root of 91115645 is about 9545.4515346316. The cubic root of 91115645 is about 449.9846002960.

The spelling of 91115645 in words is "ninety-one million, one hundred fifteen thousand, six hundred forty-five".