91163745 has 32 divisors (see below), whose sum is σ = 166458240. Its totient is φ = 47304000.

The previous prime is 91163687. The next prime is 91163771. The reversal of 91163745 is 54736119.

91163745 is a `hidden beast` number, since 9 + 11 + 637 + 4 + 5 = 666.

It is not a de Polignac number, because 91163745 - 2⁸ = 91163489 is a prime.

It is a Curzon 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 31 ways as a sum of consecutive naturals, for example, 4131 + ... + 14120.

It is an arithmetic number, because the mean of its divisors is an integer number (5201820).

Almost surely, 2^91163745 is an apocalyptic number.

It is an amenable number.

91163745 is a deficient number, since it is larger than the sum of its proper divisors (75294495).

91163745 is a wasteful number, since it uses less digits than its factorization.

91163745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18302 (or 18296 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 91163745 is about 9547.9707268089. The cubic root of 91163745 is about 450.0637687408.

The spelling of 91163745 in words is "ninety-one million, one hundred sixty-three thousand, seven hundred forty-five".