108491309 has 2 divisors, whose sum is σ = 108491310. Its totient is φ = 108491308.

The previous prime is 108491293. The next prime is 108491321. The reversal of 108491309 is 903194801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84235684 + 24255625 = 9178^2 + 4925^2 .

It is an emirp because it is prime and its reverse (903194801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 108491309 - 2⁴ = 108491293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108491329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54245654 + 54245655.

It is an arithmetic number, because the mean of its divisors is an integer number (54245655).

Almost surely, 2^108491309 is an apocalyptic number.

It is an amenable number.

108491309 is a deficient number, since it is larger than the sum of its proper divisors (1).

108491309 is an equidigital number, since it uses as much as digits as its factorization.

108491309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 108491309 is about 10415.9161382953. The cubic root of 108491309 is about 476.9413570417.

The spelling of 108491309 in words is "one hundred eight million, four hundred ninety-one thousand, three hundred nine".