56173309 has 2 divisors, whose sum is σ = 56173310. Its totient is φ = 56173308.

The previous prime is 56173303. The next prime is 56173339. The reversal of 56173309 is 90337165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54804409 + 1368900 = 7403^2 + 1170^2 .

It is a cyclic number.

It is not a de Polignac number, because 56173309 - 2³ = 56173301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56173301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28086654 + 28086655.

It is an arithmetic number, because the mean of its divisors is an integer number (28086655).

Almost surely, 2^56173309 is an apocalyptic number.

It is an amenable number.

56173309 is a deficient number, since it is larger than the sum of its proper divisors (1).

56173309 is an equidigital number, since it uses as much as digits as its factorization.

56173309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17010, while the sum is 34.

The square root of 56173309 is about 7494.8855228082. The cubic root of 56173309 is about 382.9805065215.

The spelling of 56173309 in words is "fifty-six million, one hundred seventy-three thousand, three hundred nine".