557743621 has 4 divisors (see below), whose sum is σ = 557815500. Its totient is φ = 557671744.

The previous prime is 557743603. The next prime is 557743639. The reversal of 557743621 is 126347755.

557743621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126347755 = 5 ⋅25269551.

It is an interprime number because it is at equal distance from previous prime (557743603) and next prime (557743639).

It can be written as a sum of positive squares in 2 ways, for example, as 240405025 + 317338596 = 15505^2 + 17814^2 .

It is a cyclic number.

It is not a de Polignac number, because 557743621 - 2²⁵ = 524189189 is a prime.

It is a super-2 number, since 2×557743621² = 622155893532383282, 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 (557747621) 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, 22666 + ... + 40363.

It is an arithmetic number, because the mean of its divisors is an integer number (139453875).

Almost surely, 2^557743621 is an apocalyptic number.

It is an amenable number.

557743621 is a deficient number, since it is larger than the sum of its proper divisors (71879).

557743621 is an equidigital number, since it uses as much as digits as its factorization.

557743621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71878.

The product of its digits is 176400, while the sum is 40.

The square root of 557743621 is about 23616.5963042941. The cubic root of 557743621 is about 823.1485243419.

It can be divided in two parts, 55774 and 3621, that added together give a palindrome (59395).

The spelling of 557743621 in words is "five hundred fifty-seven million, seven hundred forty-three thousand, six hundred twenty-one".