90233391 has 4 divisors (see below), whose sum is σ = 120311192. Its totient is φ = 60155592.

The previous prime is 90233383. The next prime is 90233447. The reversal of 90233391 is 19333209.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 90233391 - 2³ = 90233383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90233321) 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, 15038896 + ... + 15038901.

It is an arithmetic number, because the mean of its divisors is an integer number (30077798).

Almost surely, 2^90233391 is an apocalyptic number.

90233391 is a deficient number, since it is larger than the sum of its proper divisors (30077801).

90233391 is a wasteful number, since it uses less digits than its factorization.

90233391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30077800.

The product of its (nonzero) digits is 4374, while the sum is 30.

The square root of 90233391 is about 9499.1258018830. The cubic root of 90233391 is about 448.5275178894.

The spelling of 90233391 in words is "ninety million, two hundred thirty-three thousand, three hundred ninety-one".