16001431 has 2 divisors, whose sum is σ = 16001432. Its totient is φ = 16001430.

The previous prime is 16001429. The next prime is 16001441. The reversal of 16001431 is 13410061.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16001431 - 2¹ = 16001429 is a prime.

It is a super-2 number, since 2×16001431² = 512091588095522, which contains 22 as substring.

Together with 16001429, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16001441) 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, 8000715 + 8000716.

It is an arithmetic number, because the mean of its divisors is an integer number (8000716).

Almost surely, 2^16001431 is an apocalyptic number.

16001431 is a deficient number, since it is larger than the sum of its proper divisors (1).

16001431 is an equidigital number, since it uses as much as digits as its factorization.

16001431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 16001431 is about 4000.1788710006. The cubic root of 16001431 is about 251.9917220343.

Adding to 16001431 its reverse (13410061), we get a palindrome (29411492).

The spelling of 16001431 in words is "sixteen million, one thousand, four hundred thirty-one".