209422859 has 2 divisors, whose sum is σ = 209422860. Its totient is φ = 209422858.

The previous prime is 209422831. The next prime is 209422867. The reversal of 209422859 is 958224902.

209422859 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209422859 is a prime.

It is not a weakly prime, because it can be changed into another prime (209422879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104711429 + 104711430.

It is an arithmetic number, because the mean of its divisors is an integer number (104711430).

Almost surely, 2^209422859 is an apocalyptic number.

209422859 is a deficient number, since it is larger than the sum of its proper divisors (1).

209422859 is an equidigital number, since it uses as much as digits as its factorization.

209422859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 209422859 is about 14471.4497891538. The cubic root of 209422859 is about 593.8471748764.

The spelling of 209422859 in words is "two hundred nine million, four hundred twenty-two thousand, eight hundred fifty-nine".