16431551317 has 4 divisors (see below), whose sum is σ = 16432081920. Its totient is φ = 16431020716.

The previous prime is 16431551303. The next prime is 16431551321. The reversal of 16431551317 is 71315513461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16431551317 - 2¹¹ = 16431549269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16431551387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215767 + ... + 281812.

It is an arithmetic number, because the mean of its divisors is an integer number (4108020480).

Almost surely, 2^16431551317 is an apocalyptic number.

It is an amenable number.

16431551317 is a deficient number, since it is larger than the sum of its proper divisors (530603).

16431551317 is an equidigital number, since it uses as much as digits as its factorization.

16431551317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530602.

The product of its digits is 37800, while the sum is 37.

The spelling of 16431551317 in words is "sixteen billion, four hundred thirty-one million, five hundred fifty-one thousand, three hundred seventeen".