556117891 has 32 divisors (see below), whose sum is σ = 680803200. Its totient is φ = 444165120.

The previous prime is 556117883. The next prime is 556117927. The reversal of 556117891 is 198711655.

It is not a de Polignac number, because 556117891 - 2³ = 556117883 is a prime.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (556117811) 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, 906901 + ... + 907513.

It is an arithmetic number, because the mean of its divisors is an integer number (21275100).

Almost surely, 2^556117891 is an apocalyptic number.

556117891 is a deficient number, since it is larger than the sum of its proper divisors (124685309).

556117891 is a wasteful number, since it uses less digits than its factorization.

556117891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799.

The product of its digits is 75600, while the sum is 43.

The square root of 556117891 is about 23582.1519586318. The cubic root of 556117891 is about 822.3479656045.

The spelling of 556117891 in words is "five hundred fifty-six million, one hundred seventeen thousand, eight hundred ninety-one".