16443431 has 2 divisors, whose sum is σ = 16443432. Its totient is φ = 16443430.

The previous prime is 16443397. The next prime is 16443451. The reversal of 16443431 is 13434461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16443431 - 2¹⁰ = 16442407 is a prime.

It is a super-3 number, since 3×16443431³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16443431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16443451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8221715 + 8221716.

It is an arithmetic number, because the mean of its divisors is an integer number (8221716).

Almost surely, 2^16443431 is an apocalyptic number.

16443431 is a deficient number, since it is larger than the sum of its proper divisors (1).

16443431 is an equidigital number, since it uses as much as digits as its factorization.

16443431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 26.

The square root of 16443431 is about 4055.0500613433. The cubic root of 16443431 is about 254.2908968019.

Adding to 16443431 its reverse (13434461), we get a palindrome (29877892).

The spelling of 16443431 in words is "sixteen million, four hundred forty-three thousand, four hundred thirty-one".