16180909 has 2 divisors, whose sum is σ = 16180910. Its totient is φ = 16180908.

The previous prime is 16180903. The next prime is 16180919. The reversal of 16180909 is 90908161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15721225 + 459684 = 3965^2 + 678^2 .

It is a cyclic number.

It is not a de Polignac number, because 16180909 - 2⁷ = 16180781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16180903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8090454 + 8090455.

It is an arithmetic number, because the mean of its divisors is an integer number (8090455).

Almost surely, 2^16180909 is an apocalyptic number.

It is an amenable number.

16180909 is a deficient number, since it is larger than the sum of its proper divisors (1).

16180909 is an equidigital number, since it uses as much as digits as its factorization.

16180909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 16180909 is about 4022.5500618389. The cubic root of 16180909 is about 252.9303656256.

The spelling of 16180909 in words is "sixteen million, one hundred eighty thousand, nine hundred nine".