56020409 has 2 divisors, whose sum is σ = 56020410. Its totient is φ = 56020408.

The previous prime is 56020403. The next prime is 56020429. The reversal of 56020409 is 90402065.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48163600 + 7856809 = 6940^2 + 2803^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56020409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56020403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28010204 + 28010205.

It is an arithmetic number, because the mean of its divisors is an integer number (28010205).

Almost surely, 2^56020409 is an apocalyptic number.

It is an amenable number.

56020409 is a deficient number, since it is larger than the sum of its proper divisors (1).

56020409 is an equidigital number, since it uses as much as digits as its factorization.

56020409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 56020409 is about 7484.6782829992. The cubic root of 56020409 is about 382.6327083053.

The spelling of 56020409 in words is "fifty-six million, twenty thousand, four hundred nine".