90593621 has 4 divisors (see below), whose sum is σ = 91063212. Its totient is φ = 90124032.

The previous prime is 90593611. The next prime is 90593623. The reversal of 90593621 is 12639509.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12639509 = 163 ⋅77543.

It can be written as a sum of positive squares in 2 ways, for example, as 10491121 + 80102500 = 3239^2 + 8950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90593621 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 (90593623) 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, 234506 + ... + 234891.

It is an arithmetic number, because the mean of its divisors is an integer number (22765803).

Almost surely, 2^90593621 is an apocalyptic number.

It is an amenable number.

90593621 is a deficient number, since it is larger than the sum of its proper divisors (469591).

90593621 is a wasteful number, since it uses less digits than its factorization.

90593621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469590.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 90593621 is about 9518.0681338179. The cubic root of 90593621 is about 449.1235963136.

The spelling of 90593621 in words is "ninety million, five hundred ninety-three thousand, six hundred twenty-one".