16781459231 has 2 divisors, whose sum is σ = 16781459232. Its totient is φ = 16781459230.

The previous prime is 16781459209. The next prime is 16781459239. The reversal of 16781459231 is 13295418761.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16781459231 is a prime.

It is a super-2 number, since 2×16781459231² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16781459239) 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 as a sum of consecutive naturals, namely, 8390729615 + 8390729616.

It is an arithmetic number, because the mean of its divisors is an integer number (8390729616).

Almost surely, 2^16781459231 is an apocalyptic number.

16781459231 is a deficient number, since it is larger than the sum of its proper divisors (1).

16781459231 is an equidigital number, since it uses as much as digits as its factorization.

16781459231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 47.

The spelling of 16781459231 in words is "sixteen billion, seven hundred eighty-one million, four hundred fifty-nine thousand, two hundred thirty-one".