209964413 has 2 divisors, whose sum is σ = 209964414. Its totient is φ = 209964412.

The previous prime is 209964409. The next prime is 209964449. The reversal of 209964413 is 314469902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188183524 + 21780889 = 13718^2 + 4667^2 .

It is a cyclic number.

It is not a de Polignac number, because 209964413 - 2² = 209964409 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209966413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104982206 + 104982207.

It is an arithmetic number, because the mean of its divisors is an integer number (104982207).

Almost surely, 2^209964413 is an apocalyptic number.

It is an amenable number.

209964413 is a deficient number, since it is larger than the sum of its proper divisors (1).

209964413 is an equidigital number, since it uses as much as digits as its factorization.

209964413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 209964413 is about 14490.1488260128. The cubic root of 209964413 is about 594.3586177683.

The spelling of 209964413 in words is "two hundred nine million, nine hundred sixty-four thousand, four hundred thirteen".