556729109 has 2 divisors, whose sum is σ = 556729110. Its totient is φ = 556729108.

The previous prime is 556729081. The next prime is 556729177. The reversal of 556729109 is 901927655.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 288490225 + 268238884 = 16985^2 + 16378^2 .

It is a cyclic number.

It is not a de Polignac number, because 556729109 - 2²⁰ = 555680533 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 556729109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556729189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278364554 + 278364555.

It is an arithmetic number, because the mean of its divisors is an integer number (278364555).

Almost surely, 2^556729109 is an apocalyptic number.

It is an amenable number.

556729109 is a deficient number, since it is larger than the sum of its proper divisors (1).

556729109 is an equidigital number, since it uses as much as digits as its factorization.

556729109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 170100, while the sum is 44.

The square root of 556729109 is about 23595.1077344436. The cubic root of 556729109 is about 822.6491306718.

The spelling of 556729109 in words is "five hundred fifty-six million, seven hundred twenty-nine thousand, one hundred nine".