56699639 has 2 divisors, whose sum is σ = 56699640. Its totient is φ = 56699638.

The previous prime is 56699627. The next prime is 56699653. The reversal of 56699639 is 93699665.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56699639 - 2¹⁶ = 56634103 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56699609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28349819 + 28349820.

It is an arithmetic number, because the mean of its divisors is an integer number (28349820).

Almost surely, 2^56699639 is an apocalyptic number.

56699639 is a deficient number, since it is larger than the sum of its proper divisors (1).

56699639 is an equidigital number, since it uses as much as digits as its factorization.

56699639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2361960, while the sum is 53.

The square root of 56699639 is about 7529.9162677947. The cubic root of 56699639 is about 384.1729341699.

The spelling of 56699639 in words is "fifty-six million, six hundred ninety-nine thousand, six hundred thirty-nine".