91864605 has 32 divisors (see below), whose sum is σ = 173779200. Its totient is φ = 40545792.

The previous prime is 91864603. The next prime is 91864607. The reversal of 91864605 is 50646819.

It is an interprime number because it is at equal distance from previous prime (91864603) and next prime (91864607).

It is not a de Polignac number, because 91864605 - 2¹ = 91864603 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91864603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12040 + ... + 18129.

It is an arithmetic number, because the mean of its divisors is an integer number (5430600).

Almost surely, 2^91864605 is an apocalyptic number.

It is an amenable number.

91864605 is a deficient number, since it is larger than the sum of its proper divisors (81914595).

91864605 is a wasteful number, since it uses less digits than its factorization.

91864605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30213.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 91864605 is about 9584.6024956698. The cubic root of 91864605 is about 451.2141777821.

The spelling of 91864605 in words is "ninety-one million, eight hundred sixty-four thousand, six hundred five".