16390109 has 2 divisors, whose sum is σ = 16390110. Its totient is φ = 16390108.

The previous prime is 16390097. The next prime is 16390111. The reversal of 16390109 is 90109361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10582009 + 5808100 = 3253^2 + 2410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16390109 is a prime.

Together with 16390111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16395109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8195054 + 8195055.

It is an arithmetic number, because the mean of its divisors is an integer number (8195055).

Almost surely, 2^16390109 is an apocalyptic number.

It is an amenable number.

16390109 is a deficient number, since it is larger than the sum of its proper divisors (1).

16390109 is an equidigital number, since it uses as much as digits as its factorization.

16390109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 16390109 is about 4048.4699578977. The cubic root of 16390109 is about 254.0157315571.

The spelling of 16390109 in words is "sixteen million, three hundred ninety thousand, one hundred nine".