90312081 has 8 divisors (see below), whose sum is σ = 120802080. Its totient is φ = 60015072.

The previous prime is 90312049. The next prime is 90312107. The reversal of 90312081 is 18021309.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90312081 - 2⁵ = 90312049 is a prime.

It is a super-2 number, since 2×90312081² = 16312543949101122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90312011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47151 + ... + 49028.

It is an arithmetic number, because the mean of its divisors is an integer number (15100260).

Almost surely, 2^90312081 is an apocalyptic number.

It is an amenable number.

90312081 is a deficient number, since it is larger than the sum of its proper divisors (30489999).

90312081 is a wasteful number, since it uses less digits than its factorization.

90312081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96495.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 90312081 is about 9503.2668593489. The cubic root of 90312081 is about 448.6578627471.

The spelling of 90312081 in words is "ninety million, three hundred twelve thousand, eighty-one".