16231377989 has 2 divisors, whose sum is σ = 16231377990. Its totient is φ = 16231377988.

The previous prime is 16231377977. The next prime is 16231378049. The reversal of 16231377989 is 98977313261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10979477089 + 5251900900 = 104783^2 + 72470^2 .

It is a cyclic number.

It is not a de Polignac number, because 16231377989 - 2⁴ = 16231377973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16231373989) 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, 8115688994 + 8115688995.

It is an arithmetic number, because the mean of its divisors is an integer number (8115688995).

Almost surely, 2^16231377989 is an apocalyptic number.

It is an amenable number.

16231377989 is a deficient number, since it is larger than the sum of its proper divisors (1).

16231377989 is an equidigital number, since it uses as much as digits as its factorization.

16231377989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3429216, while the sum is 56.

The spelling of 16231377989 in words is "sixteen billion, two hundred thirty-one million, three hundred seventy-seven thousand, nine hundred eighty-nine".