209634413 has 2 divisors, whose sum is σ = 209634414. Its totient is φ = 209634412.

The previous prime is 209634401. The next prime is 209634433. The reversal of 209634413 is 314436902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164301124 + 45333289 = 12818^2 + 6733^2 .

It is a cyclic number.

It is not a de Polignac number, because 209634413 - 2⁶ = 209634349 is a prime.

It is a super-2 number, since 2×209634413² = 87893174227709138, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 209634413.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209634433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104817206 + 104817207.

It is an arithmetic number, because the mean of its divisors is an integer number (104817207).

Almost surely, 2^209634413 is an apocalyptic number.

It is an amenable number.

209634413 is a deficient number, since it is larger than the sum of its proper divisors (1).

209634413 is an equidigital number, since it uses as much as digits as its factorization.

209634413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 209634413 is about 14478.7573016471. The cubic root of 209634413 is about 594.0470710203.

The spelling of 209634413 in words is "two hundred nine million, six hundred thirty-four thousand, four hundred thirteen".