56623909 has 2 divisors, whose sum is σ = 56623910. Its totient is φ = 56623908.

The previous prime is 56623871. The next prime is 56623913. The reversal of 56623909 is 90932665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55130625 + 1493284 = 7425^2 + 1222^2 .

It is a cyclic number.

It is not a de Polignac number, because 56623909 - 2¹³ = 56615717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56623939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28311954 + 28311955.

It is an arithmetic number, because the mean of its divisors is an integer number (28311955).

Almost surely, 2^56623909 is an apocalyptic number.

It is an amenable number.

56623909 is a deficient number, since it is larger than the sum of its proper divisors (1).

56623909 is an equidigital number, since it uses as much as digits as its factorization.

56623909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 40.

The square root of 56623909 is about 7524.8859792026. The cubic root of 56623909 is about 384.0018197433.

The spelling of 56623909 in words is "fifty-six million, six hundred twenty-three thousand, nine hundred nine".