91817145 has 80 divisors (see below), whose sum is σ = 190270080. Its totient is φ = 41492736.

The previous prime is 91817123. The next prime is 91817171. The reversal of 91817145 is 54171819.

It is not a de Polignac number, because 91817145 - 2⁵ = 91817113 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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 79 ways as a sum of consecutive naturals, for example, 393949 + ... + 394181.

It is an arithmetic number, because the mean of its divisors is an integer number (2378376).

Almost surely, 2^91817145 is an apocalyptic number.

It is an amenable number.

91817145 is an abundant number, since it is smaller than the sum of its proper divisors (98452935).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91817145 is a wasteful number, since it uses less digits than its factorization.

91817145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396 (or 387 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 91817145 is about 9582.1263297871. The cubic root of 91817145 is about 451.1364608212.

The spelling of 91817145 in words is "ninety-one million, eight hundred seventeen thousand, one hundred forty-five".