90115917 has 16 divisors (see below), whose sum is σ = 129423360. Its totient is φ = 55590192.

The previous prime is 90115903. The next prime is 90115919. The reversal of 90115917 is 71951109.

It is a happy number.

It is not a de Polignac number, because 90115917 - 2⁸ = 90115661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90115919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15933 + ... + 20834.

It is an arithmetic number, because the mean of its divisors is an integer number (8088960).

Almost surely, 2^90115917 is an apocalyptic number.

It is an amenable number.

90115917 is a deficient number, since it is larger than the sum of its proper divisors (39307443).

90115917 is a wasteful number, since it uses less digits than its factorization.

90115917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36832.

The product of its (nonzero) digits is 2835, while the sum is 33.

The square root of 90115917 is about 9492.9403769327. The cubic root of 90115917 is about 448.3327887791.

The spelling of 90115917 in words is "ninety million, one hundred fifteen thousand, nine hundred seventeen".