556251621 has 16 divisors (see below), whose sum is σ = 754558464. Its totient is φ = 364416624.

The previous prime is 556251613. The next prime is 556251623. The reversal of 556251621 is 126152655.

It is not a de Polignac number, because 556251621 - 2³ = 556251613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556251623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85920 + ... + 92166.

It is an arithmetic number, because the mean of its divisors is an integer number (47159904).

Almost surely, 2^556251621 is an apocalyptic number.

It is an amenable number.

556251621 is a deficient number, since it is larger than the sum of its proper divisors (198306843).

556251621 is a wasteful number, since it uses less digits than its factorization.

556251621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6760.

The product of its digits is 18000, while the sum is 33.

The square root of 556251621 is about 23584.9871952477. The cubic root of 556251621 is about 822.4138771563.

The spelling of 556251621 in words is "five hundred fifty-six million, two hundred fifty-one thousand, six hundred twenty-one".