16138009 has 2 divisors, whose sum is σ = 16138010. Its totient is φ = 16138008.

The previous prime is 16137991. The next prime is 16138013. The reversal of 16138009 is 90083161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13162384 + 2975625 = 3628^2 + 1725^2 .

It is a cyclic number.

It is not a de Polignac number, because 16138009 - 2¹⁵ = 16105241 is a prime.

It is not a weakly prime, because it can be changed into another prime (16138609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8069004 + 8069005.

It is an arithmetic number, because the mean of its divisors is an integer number (8069005).

Almost surely, 2^16138009 is an apocalyptic number.

It is an amenable number.

16138009 is a deficient number, since it is larger than the sum of its proper divisors (1).

16138009 is an equidigital number, since it uses as much as digits as its factorization.

16138009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 16138009 is about 4017.2140844122. The cubic root of 16138009 is about 252.7066386761.

The spelling of 16138009 in words is "sixteen million, one hundred thirty-eight thousand, nine".