556172331 has 32 divisors (see below), whose sum is σ = 874019328. Its totient is φ = 310141440.

The previous prime is 556172297. The next prime is 556172347. The reversal of 556172331 is 133271655.

It is not a de Polignac number, because 556172331 - 2⁷ = 556172203 is a prime.

It is a super-2 number, since 2×556172331² = 618655323539947122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 556172292 and 556172301.

It is not an unprimeable number, because it can be changed into a prime (556172371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 142650 + ... + 146496.

It is an arithmetic number, because the mean of its divisors is an integer number (27313104).

Almost surely, 2^556172331 is an apocalyptic number.

556172331 is a deficient number, since it is larger than the sum of its proper divisors (317846997).

556172331 is a wasteful number, since it uses less digits than its factorization.

556172331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4211.

The product of its digits is 18900, while the sum is 33.

The square root of 556172331 is about 23583.3061931528. The cubic root of 556172331 is about 822.3747987413.

The spelling of 556172331 in words is "five hundred fifty-six million, one hundred seventy-two thousand, three hundred thirty-one".