556247561 has 4 divisors (see below), whose sum is σ = 566742852. Its totient is φ = 545752272.

The previous prime is 556247543. The next prime is 556247563. The reversal of 556247561 is 165742655.

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

It can be written as a sum of positive squares in 2 ways, for example, as 495329536 + 60918025 = 22256^2 + 7805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-556247561 is a prime.

It is a super-2 number, since 2×556247561² = 618822698236897442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (556247563) 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, 5247566 + ... + 5247671.

It is an arithmetic number, because the mean of its divisors is an integer number (141685713).

Almost surely, 2^556247561 is an apocalyptic number.

It is an amenable number.

556247561 is a deficient number, since it is larger than the sum of its proper divisors (10495291).

556247561 is a wasteful number, since it uses less digits than its factorization.

556247561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10495290.

The product of its digits is 252000, while the sum is 41.

The square root of 556247561 is about 23584.9011233882. The cubic root of 556247561 is about 822.4118762581.

The spelling of 556247561 in words is "five hundred fifty-six million, two hundred forty-seven thousand, five hundred sixty-one".