16919431 has 4 divisors (see below), whose sum is σ = 16932672. Its totient is φ = 16906192.

The previous prime is 16919423. The next prime is 16919447. The reversal of 16919431 is 13491961.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16919431 - 2³ = 16919423 is a prime.

It is a super-2 number, since 2×16919431² = 572534290727522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16919401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4471 + ... + 7336.

It is an arithmetic number, because the mean of its divisors is an integer number (4233168).

Almost surely, 2^16919431 is an apocalyptic number.

16919431 is a deficient number, since it is larger than the sum of its proper divisors (13241).

16919431 is a wasteful number, since it uses less digits than its factorization.

16919431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13240.

The product of its digits is 5832, while the sum is 34.

The square root of 16919431 is about 4113.3235953423. The cubic root of 16919431 is about 256.7213086190.

It can be divided in two parts, 169 and 19431, that added together give a square (19600 = 140²).

The spelling of 16919431 in words is "sixteen million, nine hundred nineteen thousand, four hundred thirty-one".