118909409 has 2 divisors, whose sum is σ = 118909410. Its totient is φ = 118909408.

The previous prime is 118909387. The next prime is 118909447. The reversal of 118909409 is 904909811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118048225 + 861184 = 10865^2 + 928^2 .

It is a cyclic number.

It is not a de Polignac number, because 118909409 - 2²⁰ = 117860833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (118909499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59454704 + 59454705.

It is an arithmetic number, because the mean of its divisors is an integer number (59454705).

Almost surely, 2^118909409 is an apocalyptic number.

It is an amenable number.

118909409 is a deficient number, since it is larger than the sum of its proper divisors (1).

118909409 is an equidigital number, since it uses as much as digits as its factorization.

118909409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 118909409 is about 10904.5590924163. The cubic root of 118909409 is about 491.7436270348.

The spelling of 118909409 in words is "one hundred eighteen million, nine hundred nine thousand, four hundred nine".