91866465 has 12 divisors (see below), whose sum is σ = 159235284. Its totient is φ = 48995424.

The previous prime is 91866451. The next prime is 91866479. The reversal of 91866465 is 56466819.

91866465 is a `hidden beast` number, since 9 + 186 + 6 + 465 = 666.

It is an interprime number because it is at equal distance from previous prime (91866451) and next prime (91866479).

It can be written as a sum of positive squares in 2 ways, for example, as 23853456 + 68013009 = 4884^2 + 8247^2 .

It is not a de Polignac number, because 91866465 - 2⁵ = 91866433 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 2041477 = 91866465 / (9 + 1 + 8 + 6 + 6 + 4 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 91866465.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1020694 + ... + 1020783.

It is an arithmetic number, because the mean of its divisors is an integer number (13269607).

Almost surely, 2^91866465 is an apocalyptic number.

It is an amenable number.

91866465 is a deficient number, since it is larger than the sum of its proper divisors (67368819).

91866465 is a wasteful number, since it uses less digits than its factorization.

91866465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041488 (or 2041485 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 91866465 is about 9584.6995258067. The cubic root of 91866465 is about 451.2172230345.

It can be divided in two parts, 9186 and 6465, that added together give a palindrome (15651).

The spelling of 91866465 in words is "ninety-one million, eight hundred sixty-six thousand, four hundred sixty-five".