16431743509 has 2 divisors, whose sum is σ = 16431743510. Its totient is φ = 16431743508.

The previous prime is 16431743483. The next prime is 16431743543. The reversal of 16431743509 is 90534713461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16366084900 + 65658609 = 127930^2 + 8103^2 .

It is a cyclic number.

It is not a de Polignac number, because 16431743509 - 2⁵ = 16431743477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16431743599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8215871754 + 8215871755.

It is an arithmetic number, because the mean of its divisors is an integer number (8215871755).

Almost surely, 2^16431743509 is an apocalyptic number.

It is an amenable number.

16431743509 is a deficient number, since it is larger than the sum of its proper divisors (1).

16431743509 is an equidigital number, since it uses as much as digits as its factorization.

16431743509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 16431743509 in words is "sixteen billion, four hundred thirty-one million, seven hundred forty-three thousand, five hundred nine".