556815913 has 2 divisors, whose sum is σ = 556815914. Its totient is φ = 556815912.

The previous prime is 556815871. The next prime is 556815949. The reversal of 556815913 is 319518655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 334597264 + 222218649 = 18292^2 + 14907^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-556815913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 556815913.

It is not a weakly prime, because it can be changed into another prime (556815953) 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 as a sum of consecutive naturals, namely, 278407956 + 278407957.

It is an arithmetic number, because the mean of its divisors is an integer number (278407957).

Almost surely, 2^556815913 is an apocalyptic number.

It is an amenable number.

556815913 is a deficient number, since it is larger than the sum of its proper divisors (1).

556815913 is an equidigital number, since it uses as much as digits as its factorization.

556815913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162000, while the sum is 43.

The square root of 556815913 is about 23596.9471118617. The cubic root of 556815913 is about 822.6918836750.

The spelling of 556815913 in words is "five hundred fifty-six million, eight hundred fifteen thousand, nine hundred thirteen".