556155869 has 2 divisors, whose sum is σ = 556155870. Its totient is φ = 556155868.

The previous prime is 556155839. The next prime is 556155877. The reversal of 556155869 is 968551655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 555214969 + 940900 = 23563^2 + 970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-556155869 is a prime.

It is a super-2 number, since 2×556155869² = 618618701246290322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556155839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278077934 + 278077935.

It is an arithmetic number, because the mean of its divisors is an integer number (278077935).

Almost surely, 2^556155869 is an apocalyptic number.

It is an amenable number.

556155869 is a deficient number, since it is larger than the sum of its proper divisors (1).

556155869 is an equidigital number, since it uses as much as digits as its factorization.

556155869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620000, while the sum is 50.

The square root of 556155869 is about 23582.9571725007. The cubic root of 556155869 is about 822.3666849088.

The spelling of 556155869 in words is "five hundred fifty-six million, one hundred fifty-five thousand, eight hundred sixty-nine".