90590421 has 4 divisors (see below), whose sum is σ = 120787232. Its totient is φ = 60393612.

The previous prime is 90590417. The next prime is 90590431. The reversal of 90590421 is 12409509.

It is a happy number.

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 not a de Polignac number, because 90590421 - 2² = 90590417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90590431) 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, 15098401 + ... + 15098406.

It is an arithmetic number, because the mean of its divisors is an integer number (30196808).

Almost surely, 2^90590421 is an apocalyptic number.

It is an amenable number.

90590421 is a deficient number, since it is larger than the sum of its proper divisors (30196811).

90590421 is a wasteful number, since it uses less digits than its factorization.

90590421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30196810.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 90590421 is about 9517.9000309942. The cubic root of 90590421 is about 449.1183081840.

The spelling of 90590421 in words is "ninety million, five hundred ninety thousand, four hundred twenty-one".