91505765 has 16 divisors (see below), whose sum is σ = 118540800. Its totient is φ = 67409472.

The previous prime is 91505761. The next prime is 91505783. The reversal of 91505765 is 56750519.

It is not a de Polignac number, because 91505765 - 2² = 91505761 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91505761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29666 + ... + 32604.

It is an arithmetic number, because the mean of its divisors is an integer number (7408800).

Almost surely, 2^91505765 is an apocalyptic number.

It is an amenable number.

91505765 is a deficient number, since it is larger than the sum of its proper divisors (27035035).

91505765 is a wasteful number, since it uses less digits than its factorization.

91505765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3436.

The product of its (nonzero) digits is 47250, while the sum is 38.

The square root of 91505765 is about 9565.8645714854. The cubic root of 91505765 is about 450.6259026941.

The spelling of 91505765 in words is "ninety-one million, five hundred five thousand, seven hundred sixty-five".