13139909 has 2 divisors, whose sum is σ = 13139910. Its totient is φ = 13139908.

The previous prime is 13139891. The next prime is 13139941. The reversal of 13139909 is 90993131.

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., 13118884 + 21025 = 3622^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 13139909 - 2⁸ = 13139653 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13139989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6569954 + 6569955.

It is an arithmetic number, because the mean of its divisors is an integer number (6569955).

Almost surely, 2^13139909 is an apocalyptic number.

It is an amenable number.

13139909 is a deficient number, since it is larger than the sum of its proper divisors (1).

13139909 is an equidigital number, since it uses as much as digits as its factorization.

13139909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6561, while the sum is 35.

The square root of 13139909 is about 3624.9012400340. The cubic root of 13139909 is about 235.9739809005.

The spelling of 13139909 in words is "thirteen million, one hundred thirty-nine thousand, nine hundred nine".