556115621 has 2 divisors, whose sum is σ = 556115622. Its totient is φ = 556115620.

The previous prime is 556115569. The next prime is 556115627. The reversal of 556115621 is 126511655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 544288900 + 11826721 = 23330^2 + 3439^2 .

It is a cyclic number.

It is not a de Polignac number, because 556115621 - 2¹⁰ = 556114597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556115627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278057810 + 278057811.

It is an arithmetic number, because the mean of its divisors is an integer number (278057811).

Almost surely, 2^556115621 is an apocalyptic number.

It is an amenable number.

556115621 is a deficient number, since it is larger than the sum of its proper divisors (1).

556115621 is an equidigital number, since it uses as much as digits as its factorization.

556115621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 32.

The square root of 556115621 is about 23582.1038289632. The cubic root of 556115621 is about 822.3468466976.

The spelling of 556115621 in words is "five hundred fifty-six million, one hundred fifteen thousand, six hundred twenty-one".