90125581 has 16 divisors (see below), whose sum is σ = 112451584. Its totient is φ = 70326144.

The previous prime is 90125579. The next prime is 90125593. The reversal of 90125581 is 18552109.

It is not a de Polignac number, because 90125581 - 2¹ = 90125579 is a prime.

It is a super-2 number, since 2×90125581² = 16245240701175122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90225581) 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, 141 + ... + 13426.

It is an arithmetic number, because the mean of its divisors is an integer number (7028224).

Almost surely, 2^90125581 is an apocalyptic number.

90125581 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

90125581 is a deficient number, since it is larger than the sum of its proper divisors (22326003).

90125581 is a wasteful number, since it uses less digits than its factorization.

90125581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13660.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 90125581 is about 9493.4493731204. The cubic root of 90125581 is about 448.3488145576.

The spelling of 90125581 in words is "ninety million, one hundred twenty-five thousand, five hundred eighty-one".