556172839 has 4 divisors (see below), whose sum is σ = 561370824. Its totient is φ = 550974856.

The previous prime is 556172809. The next prime is 556172849. The reversal of 556172839 is 938271655.

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

It is a cyclic number.

It is not a de Polignac number, because 556172839 - 2⁷ = 556172711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556172809) 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, 2598832 + ... + 2599045.

It is an arithmetic number, because the mean of its divisors is an integer number (140342706).

Almost surely, 2^556172839 is an apocalyptic number.

556172839 is a deficient number, since it is larger than the sum of its proper divisors (5197985).

556172839 is a wasteful number, since it uses less digits than its factorization.

556172839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5197984.

The product of its digits is 453600, while the sum is 46.

The square root of 556172839 is about 23583.3169634808. The cubic root of 556172839 is about 822.3750491231.

It can be divided in two parts, 5561 and 72839, that added together give a square (78400 = 280²).

The spelling of 556172839 in words is "five hundred fifty-six million, one hundred seventy-two thousand, eight hundred thirty-nine".