90115081 has 32 divisors (see below), whose sum is σ = 114739200. Its totient is φ = 68999040.

The previous prime is 90115073. The next prime is 90115087. The reversal of 90115081 is 18051109.

It is a 4-Lehmer number, since φ(90115081) divides (90115081-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 90115081 - 2³ = 90115073 is a prime.

It is a super-2 number, since 2×90115081² = 16241455647273122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90115087) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 272086 + ... + 272416.

It is an arithmetic number, because the mean of its divisors is an integer number (3585600).

Almost surely, 2^90115081 is an apocalyptic number.

It is an amenable number.

90115081 is a deficient number, since it is larger than the sum of its proper divisors (24624119).

90115081 is a wasteful number, since it uses less digits than its factorization.

90115081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469.

The product of its (nonzero) digits is 360, while the sum is 25.

The square root of 90115081 is about 9492.8963441091. The cubic root of 90115081 is about 448.3314023892.

The spelling of 90115081 in words is "ninety million, one hundred fifteen thousand, eighty-one".