90975081 has 4 divisors (see below), whose sum is σ = 121300112. Its totient is φ = 60650052.

The previous prime is 90975067. The next prime is 90975089. The reversal of 90975081 is 18057909.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 90975081 - 2⁷ = 90974953 is a prime.

It is a super-2 number, since 2×90975081² = 16552930725913122, 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 (90975089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15162511 + ... + 15162516.

It is an arithmetic number, because the mean of its divisors is an integer number (30325028).

Almost surely, 2^90975081 is an apocalyptic number.

It is an amenable number.

90975081 is a deficient number, since it is larger than the sum of its proper divisors (30325031).

90975081 is a wasteful number, since it uses less digits than its factorization.

90975081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30325030.

The product of its (nonzero) digits is 22680, while the sum is 39.

The square root of 90975081 is about 9538.0858142502. The cubic root of 90975081 is about 449.7530842948.

The spelling of 90975081 in words is "ninety million, nine hundred seventy-five thousand, eighty-one".