621490559 has 4 divisors (see below), whose sum is σ = 624069600. Its totient is φ = 618911520.

The previous prime is 621490553. The next prime is 621490579. The reversal of 621490559 is 955094126.

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

It is a cyclic number.

It is not a de Polignac number, because 621490559 - 2²⁸ = 353055103 is a prime.

It is a super-2 number, since 2×621490559² = 772501029852264962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621490553) 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, 1289159 + ... + 1289640.

It is an arithmetic number, because the mean of its divisors is an integer number (156017400).

Almost surely, 2^621490559 is an apocalyptic number.

621490559 is a deficient number, since it is larger than the sum of its proper divisors (2579041).

621490559 is a wasteful number, since it uses less digits than its factorization.

621490559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2579040.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 621490559 is about 24929.7123729898. The cubic root of 621490559 is about 853.3846861220.

The spelling of 621490559 in words is "six hundred twenty-one million, four hundred ninety thousand, five hundred fifty-nine".