16319999 has 2 divisors, whose sum is σ = 16320000. Its totient is φ = 16319998.

The previous prime is 16319977. The next prime is 16320023. The reversal of 16319999 is 99991361.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16319999 - 2¹⁶ = 16254463 is a prime.

It is a Chen prime.

16319999 is a modest number, since divided by 9999 gives 1631 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16319909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8159999 + 8160000.

It is an arithmetic number, because the mean of its divisors is an integer number (8160000).

Almost surely, 2^16319999 is an apocalyptic number.

16319999 is a deficient number, since it is larger than the sum of its proper divisors (1).

16319999 is an equidigital number, since it uses as much as digits as its factorization.

16319999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 118098, while the sum is 47.

The square root of 16319999 is about 4039.8018515764. The cubic root of 16319999 is about 253.6530230346.

The spelling of 16319999 in words is "sixteen million, three hundred nineteen thousand, nine hundred ninety-nine".