91451985 has 16 divisors (see below), whose sum is σ = 148508736. Its totient is φ = 48045888.

The previous prime is 91451929. The next prime is 91452007. The reversal of 91451985 is 58915419.

It is a de Polignac number, because none of the positive numbers 2^k-91451985 is a prime.

It is a Curzon 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, 44494 + ... + 46503.

It is an arithmetic number, because the mean of its divisors is an integer number (9281796).

Almost surely, 2^91451985 is an apocalyptic number.

It is an amenable number.

91451985 is a deficient number, since it is larger than the sum of its proper divisors (57056751).

91451985 is a wasteful number, since it uses less digits than its factorization.

91451985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91072.

The product of its digits is 64800, while the sum is 42.

The square root of 91451985 is about 9563.0531212579. The cubic root of 91451985 is about 450.5376043945.

The spelling of 91451985 in words is "ninety-one million, four hundred fifty-one thousand, nine hundred eighty-five".