56398609 has 2 divisors, whose sum is σ = 56398610. Its totient is φ = 56398608.

The previous prime is 56398607. The next prime is 56398633. The reversal of 56398609 is 90689365.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56205009 + 193600 = 7497^2 + 440^2 .

It is a cyclic number.

It is not a de Polignac number, because 56398609 - 2¹ = 56398607 is a prime.

Together with 56398607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (56398603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28199304 + 28199305.

It is an arithmetic number, because the mean of its divisors is an integer number (28199305).

Almost surely, 2^56398609 is an apocalyptic number.

It is an amenable number.

56398609 is a deficient number, since it is larger than the sum of its proper divisors (1).

56398609 is an equidigital number, since it uses as much as digits as its factorization.

56398609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 56398609 is about 7509.9007317008. The cubic root of 56398609 is about 383.4918431212.

The spelling of 56398609 in words is "fifty-six million, three hundred ninety-eight thousand, six hundred nine".