90135081 has 6 divisors (see below), whose sum is σ = 130195130. Its totient is φ = 60090048.

The previous prime is 90135061. The next prime is 90135083. The reversal of 90135081 is 18053109.

It can be written as a sum of positive squares in only one way, i.e., 75846681 + 14288400 = 8709^2 + 3780^2 .

It is not a de Polignac number, because 90135081 - 2²⁵ = 56580649 is a prime.

It is a super-2 number, since 2×90135081² = 16248665653753122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90135083) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5007496 + ... + 5007513.

Almost surely, 2^90135081 is an apocalyptic number.

It is an amenable number.

90135081 is a deficient number, since it is larger than the sum of its proper divisors (40060049).

90135081 is a wasteful number, since it uses less digits than its factorization.

90135081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10015015 (or 10015012 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 90135081 is about 9493.9497049437. The cubic root of 90135081 is about 448.3645672590.

The spelling of 90135081 in words is "ninety million, one hundred thirty-five thousand, eighty-one".