91312168 has 32 divisors (see below), whose sum is σ = 182376360. Its totient is φ = 42711040.

The previous prime is 91312153. The next prime is 91312183. The reversal of 91312168 is 86121319.

It is an interprime number because it is at equal distance from previous prime (91312153) and next prime (91312183).

It can be written as a sum of positive squares in 4 ways, for example, as 90973444 + 338724 = 9538^2 + 582^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21588 + ... + 25468.

Almost surely, 2^91312168 is an apocalyptic number.

It is an amenable number.

91312168 is a deficient number, since it is larger than the sum of its proper divisors (91064192).

91312168 is a wasteful number, since it uses less digits than its factorization.

91312168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4077 (or 4073 counting only the distinct ones).

The product of its digits is 2592, while the sum is 31.

The square root of 91312168 is about 9555.7400550664. The cubic root of 91312168 is about 450.3078847740.

The spelling of 91312168 in words is "ninety-one million, three hundred twelve thousand, one hundred sixty-eight".