209039091423 has 8 divisors (see below), whose sum is σ = 279253759536. Its totient is φ = 139091908800.

The previous prime is 209039091419. The next prime is 209039091451. The reversal of 209039091423 is 324190930902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 209039091423 - 2² = 209039091419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209039091523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66869548 + ... + 66872673.

It is an arithmetic number, because the mean of its divisors is an integer number (34906719942).

Almost surely, 2^209039091423 is an apocalyptic number.

209039091423 is a deficient number, since it is larger than the sum of its proper divisors (70214668113).

209039091423 is a wasteful number, since it uses less digits than its factorization.

209039091423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133742745.

The product of its (nonzero) digits is 104976, while the sum is 42.

The spelling of 209039091423 in words is "two hundred nine billion, thirty-nine million, ninety-one thousand, four hundred twenty-three".