557776729 has 2 divisors, whose sum is σ = 557776730. Its totient is φ = 557776728.

The previous prime is 557776679. The next prime is 557776733. The reversal of 557776729 is 927677755.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 554696704 + 3080025 = 23552^2 + 1755^2 .

It is a cyclic number.

It is not a de Polignac number, because 557776729 - 2¹⁵ = 557743961 is a prime.

It is a super-2 number, since 2×557776729² = 622229758827878882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 557776729.

It is not a weakly prime, because it can be changed into another prime (557776799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278888364 + 278888365.

It is an arithmetic number, because the mean of its divisors is an integer number (278888365).

Almost surely, 2^557776729 is an apocalyptic number.

It is an amenable number.

557776729 is a deficient number, since it is larger than the sum of its proper divisors (1).

557776729 is an equidigital number, since it uses as much as digits as its factorization.

557776729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6482700, while the sum is 55.

The square root of 557776729 is about 23617.2972416405. The cubic root of 557776729 is about 823.1648115517.

The spelling of 557776729 in words is "five hundred fifty-seven million, seven hundred seventy-six thousand, seven hundred twenty-nine".