90312891 has 8 divisors (see below), whose sum is σ = 127500624. Its totient is φ = 56666880.

The previous prime is 90312883. The next prime is 90312913. The reversal of 90312891 is 19821309.

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

It is not a de Polignac number, because 90312891 - 2³ = 90312883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90312811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 885370 + ... + 885471.

It is an arithmetic number, because the mean of its divisors is an integer number (15937578).

Almost surely, 2^90312891 is an apocalyptic number.

90312891 is a deficient number, since it is larger than the sum of its proper divisors (37187733).

90312891 is a wasteful number, since it uses less digits than its factorization.

90312891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1770861.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 90312891 is about 9503.3094761772. The cubic root of 90312891 is about 448.6592040656.

The spelling of 90312891 in words is "ninety million, three hundred twelve thousand, eight hundred ninety-one".