556391361 has 32 divisors (see below), whose sum is σ = 792126720. Its totient is φ = 346752000.

The previous prime is 556391359. The next prime is 556391393. The reversal of 556391361 is 163193655.

It is not a de Polignac number, because 556391361 - 2¹ = 556391359 is a prime.

It is not an unprimeable number, because it can be changed into a prime (556390361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 538101 + ... + 539133.

It is an arithmetic number, because the mean of its divisors is an integer number (24753960).

Almost surely, 2^556391361 is an apocalyptic number.

It is an amenable number.

556391361 is a deficient number, since it is larger than the sum of its proper divisors (235735359).

556391361 is a wasteful number, since it uses less digits than its factorization.

556391361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257.

The product of its digits is 72900, while the sum is 39.

The square root of 556391361 is about 23587.9494869732. The cubic root of 556391361 is about 822.4827395731.

The spelling of 556391361 in words is "five hundred fifty-six million, three hundred ninety-one thousand, three hundred sixty-one".