16904431 has 2 divisors, whose sum is σ = 16904432. Its totient is φ = 16904430.

The previous prime is 16904429. The next prime is 16904441. The reversal of 16904431 is 13440961.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16904431 - 2¹ = 16904429 is a prime.

It is a super-2 number, since 2×16904431² = 571519574867522, which contains 22 as substring.

Together with 16904429, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 16904431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16904411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8452215 + 8452216.

It is an arithmetic number, because the mean of its divisors is an integer number (8452216).

Almost surely, 2^16904431 is an apocalyptic number.

16904431 is a deficient number, since it is larger than the sum of its proper divisors (1).

16904431 is an equidigital number, since it uses as much as digits as its factorization.

16904431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 16904431 is about 4111.4998479873. The cubic root of 16904431 is about 256.6454203661.

The spelling of 16904431 in words is "sixteen million, nine hundred four thousand, four hundred thirty-one".