209979713 has 2 divisors, whose sum is σ = 209979714. Its totient is φ = 209979712.

The previous prime is 209979701. The next prime is 209979727. The reversal of 209979713 is 317979902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196897024 + 13082689 = 14032^2 + 3617^2 .

It is a cyclic number.

It is not a de Polignac number, because 209979713 - 2⁸ = 209979457 is a prime.

It is not a weakly prime, because it can be changed into another prime (209973713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104989856 + 104989857.

It is an arithmetic number, because the mean of its divisors is an integer number (104989857).

Almost surely, 2^209979713 is an apocalyptic number.

It is an amenable number.

209979713 is a deficient number, since it is larger than the sum of its proper divisors (1).

209979713 is an equidigital number, since it uses as much as digits as its factorization.

209979713 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 214326, while the sum is 47.

The square root of 209979713 is about 14490.6767612834. The cubic root of 209979713 is about 594.3730542878.

The spelling of 209979713 in words is "two hundred nine million, nine hundred seventy-nine thousand, seven hundred thirteen".