16423191409 has 3 divisors (see below), whose sum is σ = 16423319563. Its totient is φ = 16423063256.

The previous prime is 16423191403. The next prime is 16423191413. The reversal of 16423191409 is 90419132461.

The square root of 16423191409 is 128153.

It is a perfect power (a square), and thus also a powerful number.

16423191409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 12693402225 + 3729789184 = 112665^2 + 61072^2 .

It is not a de Polignac number, because 16423191409 - 2¹¹ = 16423189361 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16423191403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 64077 + ... + 192229.

Almost surely, 2^16423191409 is an apocalyptic number.

16423191409 is the 128153-rd square number.

16423191409 is the 64077-th centered octagonal number.

It is an amenable number.

16423191409 is a deficient number, since it is larger than the sum of its proper divisors (128154).

16423191409 is an frugal number, since it uses more digits than its factorization.

16423191409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256306 (or 128153 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

Multiplying 16423191409 by its product of nonzero digits (46656), we get a square (766240418378304 = 27681048²).

The spelling of 16423191409 in words is "sixteen billion, four hundred twenty-three million, one hundred ninety-one thousand, four hundred nine".