16715989 has 2 divisors, whose sum is σ = 16715990. Its totient is φ = 16715988.

The previous prime is 16715983. The next prime is 16716019. The reversal of 16715989 is 98951761.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16337764 + 378225 = 4042^2 + 615^2 .

It is an emirp because it is prime and its reverse (98951761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16715989 - 2¹⁵ = 16683221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16715983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8357994 + 8357995.

It is an arithmetic number, because the mean of its divisors is an integer number (8357995).

Almost surely, 2^16715989 is an apocalyptic number.

It is an amenable number.

16715989 is a deficient number, since it is larger than the sum of its proper divisors (1).

16715989 is an equidigital number, since it uses as much as digits as its factorization.

16715989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 46.

The square root of 16715989 is about 4088.5191695772. The cubic root of 16715989 is about 255.6882037747.

The spelling of 16715989 in words is "sixteen million, seven hundred fifteen thousand, nine hundred eighty-nine".