209359814423 has 2 divisors, whose sum is σ = 209359814424. Its totient is φ = 209359814422.

The previous prime is 209359814401. The next prime is 209359814441. The reversal of 209359814423 is 324418953902.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 209359814423 - 2⁶ = 209359814359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209359814023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104679907211 + 104679907212.

It is an arithmetic number, because the mean of its divisors is an integer number (104679907212).

Almost surely, 2^209359814423 is an apocalyptic number.

209359814423 is a deficient number, since it is larger than the sum of its proper divisors (1).

209359814423 is an equidigital number, since it uses as much as digits as its factorization.

209359814423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1866240, while the sum is 50.

The spelling of 209359814423 in words is "two hundred nine billion, three hundred fifty-nine million, eight hundred fourteen thousand, four hundred twenty-three".