209994263 has 2 divisors, whose sum is σ = 209994264. Its totient is φ = 209994262.

The previous prime is 209994223. The next prime is 209994271. The reversal of 209994263 is 362499902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 209994263 - 2⁸ = 209994007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209994223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104997131 + 104997132.

It is an arithmetic number, because the mean of its divisors is an integer number (104997132).

Almost surely, 2^209994263 is an apocalyptic number.

209994263 is a deficient number, since it is larger than the sum of its proper divisors (1).

209994263 is an equidigital number, since it uses as much as digits as its factorization.

209994263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 209994263 is about 14491.1787995318. The cubic root of 209994263 is about 594.3867824841.

The spelling of 209994263 in words is "two hundred nine million, nine hundred ninety-four thousand, two hundred sixty-three".