56689909 has 2 divisors, whose sum is σ = 56689910. Its totient is φ = 56689908.

The previous prime is 56689907. The next prime is 56689931. The reversal of 56689909 is 90998665.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55457809 + 1232100 = 7447^2 + 1110^2 .

It is a cyclic number.

It is not a de Polignac number, because 56689909 - 2¹ = 56689907 is a prime.

Together with 56689907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56689907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28344954 + 28344955.

It is an arithmetic number, because the mean of its divisors is an integer number (28344955).

Almost surely, 2^56689909 is an apocalyptic number.

It is an amenable number.

56689909 is a deficient number, since it is larger than the sum of its proper divisors (1).

56689909 is an equidigital number, since it uses as much as digits as its factorization.

56689909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1049760, while the sum is 52.

The square root of 56689909 is about 7529.2701505524. The cubic root of 56689909 is about 384.1509574486.

The spelling of 56689909 in words is "fifty-six million, six hundred eighty-nine thousand, nine hundred nine".