209542694323 has 2 divisors, whose sum is σ = 209542694324. Its totient is φ = 209542694322.

The previous prime is 209542694293. The next prime is 209542694407. The reversal of 209542694323 is 323496245902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209542694323 - 2³³ = 200952759731 is a prime.

It is not a weakly prime, because it can be changed into another prime (209542694423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104771347161 + 104771347162.

It is an arithmetic number, because the mean of its divisors is an integer number (104771347162).

Almost surely, 2^209542694323 is an apocalyptic number.

209542694323 is a deficient number, since it is larger than the sum of its proper divisors (1).

209542694323 is an equidigital number, since it uses as much as digits as its factorization.

209542694323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2799360, while the sum is 49.

The spelling of 209542694323 in words is "two hundred nine billion, five hundred forty-two million, six hundred ninety-four thousand, three hundred twenty-three".