91691525 has 12 divisors (see below), whose sum is σ = 113823072. Its totient is φ = 73272240.

The previous prime is 91691519. The next prime is 91691543. The reversal of 91691525 is 52519619.

It is not a de Polignac number, because 91691525 - 2⁶ = 91691461 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32834 + ... + 35516.

It is an arithmetic number, because the mean of its divisors is an integer number (9485256).

Almost surely, 2^91691525 is an apocalyptic number.

It is an amenable number.

91691525 is a deficient number, since it is larger than the sum of its proper divisors (22131547).

91691525 is a wasteful number, since it uses less digits than its factorization.

91691525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4060 (or 4055 counting only the distinct ones).

The product of its digits is 24300, while the sum is 38.

The square root of 91691525 is about 9575.5691736836. The cubic root of 91691525 is about 450.9306255272.

The spelling of 91691525 in words is "ninety-one million, six hundred ninety-one thousand, five hundred twenty-five".