16409431 has 2 divisors, whose sum is σ = 16409432. Its totient is φ = 16409430.

The previous prime is 16409429. The next prime is 16409461. The reversal of 16409431 is 13490461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16409431 - 2¹ = 16409429 is a prime.

It is a super-2 number, since 2×16409431² = 538538851487522, which contains 22 as substring.

Together with 16409429, 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 16409431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16409411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8204715 + 8204716.

It is an arithmetic number, because the mean of its divisors is an integer number (8204716).

Almost surely, 2^16409431 is an apocalyptic number.

16409431 is a deficient number, since it is larger than the sum of its proper divisors (1).

16409431 is an equidigital number, since it uses as much as digits as its factorization.

16409431 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 16409431 is about 4050.8555886380. The cubic root of 16409431 is about 254.1155105263.

Adding to 16409431 its reverse (13490461), we get a palindrome (29899892).

The spelling of 16409431 in words is "sixteen million, four hundred nine thousand, four hundred thirty-one".