108009409 has 4 divisors (see below), whose sum is σ = 108030916. Its totient is φ = 107987904.

The previous prime is 108009373. The next prime is 108009463. The reversal of 108009409 is 904900801.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30217009 + 77792400 = 5497^2 + 8820^2 .

It is a cyclic number.

It is not a de Polignac number, because 108009409 - 2¹³ = 108001217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108009479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1237 + ... + 14749.

It is an arithmetic number, because the mean of its divisors is an integer number (27007729).

Almost surely, 2^108009409 is an apocalyptic number.

It is an amenable number.

108009409 is a deficient number, since it is larger than the sum of its proper divisors (21507).

108009409 is an equidigital number, since it uses as much as digits as its factorization.

108009409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21506.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 108009409 is about 10392.7575262776. The cubic root of 108009409 is about 476.2341446856.

The spelling of 108009409 in words is "one hundred eight million, nine thousand, four hundred nine".