556061309 has 2 divisors, whose sum is σ = 556061310. Its totient is φ = 556061308.

The previous prime is 556061293. The next prime is 556061357. The reversal of 556061309 is 903160655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 382085209 + 173976100 = 19547^2 + 13190^2 .

It is a cyclic number.

It is not a de Polignac number, because 556061309 - 2⁴ = 556061293 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_29146670 and since 556061309 and 29146670 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556061369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278030654 + 278030655.

It is an arithmetic number, because the mean of its divisors is an integer number (278030655).

Almost surely, 2^556061309 is an apocalyptic number.

It is an amenable number.

556061309 is a deficient number, since it is larger than the sum of its proper divisors (1).

556061309 is an equidigital number, since it uses as much as digits as its factorization.

556061309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 556061309 is about 23580.9522496442. The cubic root of 556061309 is about 822.3200748332.

The spelling of 556061309 in words is "five hundred fifty-six million, sixty-one thousand, three hundred nine".