13908109 has 2 divisors, whose sum is σ = 13908110. Its totient is φ = 13908108.

The previous prime is 13908053. The next prime is 13908113. The reversal of 13908109 is 90180931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12460900 + 1447209 = 3530^2 + 1203^2 .

It is a cyclic number.

It is not a de Polignac number, because 13908109 - 2¹³ = 13899917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13908149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6954054 + 6954055.

It is an arithmetic number, because the mean of its divisors is an integer number (6954055).

Almost surely, 2^13908109 is an apocalyptic number.

It is an amenable number.

13908109 is a deficient number, since it is larger than the sum of its proper divisors (1).

13908109 is an equidigital number, since it uses as much as digits as its factorization.

13908109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 13908109 is about 3729.3577195008. The cubic root of 13908109 is about 240.4857580644.

The spelling of 13908109 in words is "thirteen million, nine hundred eight thousand, one hundred nine".