91475897 has 4 divisors (see below), whose sum is σ = 91801716. Its totient is φ = 91150080.

The previous prime is 91475863. The next prime is 91475911. The reversal of 91475897 is 79857419.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71503936 + 19971961 = 8456^2 + 4469^2 .

It is a cyclic number.

It is not a de Polignac number, because 91475897 - 2⁶ = 91475833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91474897) 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, 162488 + ... + 163049.

It is an arithmetic number, because the mean of its divisors is an integer number (22950429).

Almost surely, 2^91475897 is an apocalyptic number.

It is an amenable number.

91475897 is a deficient number, since it is larger than the sum of its proper divisors (325819).

91475897 is a wasteful number, since it uses less digits than its factorization.

91475897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325818.

The product of its digits is 635040, while the sum is 50.

The square root of 91475897 is about 9564.3032678810. The cubic root of 91475897 is about 450.5768684097.

The spelling of 91475897 in words is "ninety-one million, four hundred seventy-five thousand, eight hundred ninety-seven".