90575921 has 4 divisors (see below), whose sum is σ = 90595392. Its totient is φ = 90556452.

The previous prime is 90575899. The next prime is 90575939. The reversal of 90575921 is 12957509.

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 a cyclic number.

It is not a de Polignac number, because 90575921 - 2²⁶ = 23467057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90575021) 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 3 ways as a sum of consecutive naturals, for example, 1796 + ... + 13578.

It is an arithmetic number, because the mean of its divisors is an integer number (22648848).

Almost surely, 2^90575921 is an apocalyptic number.

It is an amenable number.

90575921 is a deficient number, since it is larger than the sum of its proper divisors (19471).

90575921 is a wasteful number, since it uses less digits than its factorization.

90575921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19470.

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 90575921 is about 9517.1382778648. The cubic root of 90575921 is about 449.0943447860.

The spelling of 90575921 in words is "ninety million, five hundred seventy-five thousand, nine hundred twenty-one".