209850913 has 2 divisors, whose sum is σ = 209850914. Its totient is φ = 209850912.

The previous prime is 209850887. The next prime is 209850923. The reversal of 209850913 is 319058902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172738449 + 37112464 = 13143^2 + 6092^2 .

It is a cyclic number.

It is not a de Polignac number, because 209850913 - 2¹⁷ = 209719841 is a prime.

It is not a weakly prime, because it can be changed into another prime (209850923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104925456 + 104925457.

It is an arithmetic number, because the mean of its divisors is an integer number (104925457).

Almost surely, 2^209850913 is an apocalyptic number.

It is an amenable number.

209850913 is a deficient number, since it is larger than the sum of its proper divisors (1).

209850913 is an equidigital number, since it uses as much as digits as its factorization.

209850913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 209850913 is about 14486.2318426843. The cubic root of 209850913 is about 594.2515014221.

The spelling of 209850913 in words is "two hundred nine million, eight hundred fifty thousand, nine hundred thirteen".