91861165 has 16 divisors (see below), whose sum is σ = 120548736. Its totient is φ = 66644800.

The previous prime is 91861151. The next prime is 91861169. The reversal of 91861165 is 56116819.

It is a de Polignac number, because none of the positive numbers 2^k-91861165 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91861169) 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, 23544 + ... + 27166.

It is an arithmetic number, because the mean of its divisors is an integer number (7534296).

Almost surely, 2^91861165 is an apocalyptic number.

It is an amenable number.

91861165 is a deficient number, since it is larger than the sum of its proper divisors (28687571).

91861165 is a wasteful number, since it uses less digits than its factorization.

91861165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4100.

The product of its digits is 12960, while the sum is 37.

The square root of 91861165 is about 9584.4230394949. The cubic root of 91861165 is about 451.2085455943.

The spelling of 91861165 in words is "ninety-one million, eight hundred sixty-one thousand, one hundred sixty-five".