56818409 has 2 divisors, whose sum is σ = 56818410. Its totient is φ = 56818408.

The previous prime is 56818387. The next prime is 56818427. The reversal of 56818409 is 90481865.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49392784 + 7425625 = 7028^2 + 2725^2 .

It is a cyclic number.

It is not a de Polignac number, because 56818409 - 2¹⁶ = 56752873 is a prime.

It is not a weakly prime, because it can be changed into another prime (56811409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28409204 + 28409205.

It is an arithmetic number, because the mean of its divisors is an integer number (28409205).

Almost surely, 2^56818409 is an apocalyptic number.

It is an amenable number.

56818409 is a deficient number, since it is larger than the sum of its proper divisors (1).

56818409 is an equidigital number, since it uses as much as digits as its factorization.

56818409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 56818409 is about 7537.7986839660. The cubic root of 56818409 is about 384.4409922959.

The spelling of 56818409 in words is "fifty-six million, eight hundred eighteen thousand, four hundred nine".