91875865 has 4 divisors (see below), whose sum is σ = 110251044. Its totient is φ = 73500688.

The previous prime is 91875863. The next prime is 91875877. The reversal of 91875865 is 56857819.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56857819 = 1871 ⋅30389.

It can be written as a sum of positive squares in 2 ways, for example, as 39037504 + 52838361 = 6248^2 + 7269^2 .

It is a cyclic number.

It is not a de Polignac number, because 91875865 - 2¹ = 91875863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91875863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9187582 + ... + 9187591.

It is an arithmetic number, because the mean of its divisors is an integer number (27562761).

Almost surely, 2^91875865 is an apocalyptic number.

It is an amenable number.

91875865 is a deficient number, since it is larger than the sum of its proper divisors (18375179).

91875865 is a wasteful number, since it uses less digits than its factorization.

91875865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18375178.

The product of its digits is 604800, while the sum is 49.

The square root of 91875865 is about 9585.1898781401. The cubic root of 91875865 is about 451.2326123906.

The spelling of 91875865 in words is "ninety-one million, eight hundred seventy-five thousand, eight hundred sixty-five".