90591051 has 4 divisors (see below), whose sum is σ = 120788072. Its totient is φ = 60394032.

The previous prime is 90591049. The next prime is 90591077. The reversal of 90591051 is 15019509.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15019509 = 3 ⋅5006503.

It is not a de Polignac number, because 90591051 - 2¹ = 90591049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90591251) 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, 15098506 + ... + 15098511.

It is an arithmetic number, because the mean of its divisors is an integer number (30197018).

Almost surely, 2^90591051 is an apocalyptic number.

90591051 is a deficient number, since it is larger than the sum of its proper divisors (30197021).

90591051 is a wasteful number, since it uses less digits than its factorization.

90591051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30197020.

The product of its (nonzero) digits is 2025, while the sum is 30.

The square root of 90591051 is about 9517.9331264724. The cubic root of 90591051 is about 449.1193492944.

The spelling of 90591051 in words is "ninety million, five hundred ninety-one thousand, fifty-one".