108131409 has 8 divisors (see below), whose sum is σ = 160194720. Its totient is φ = 72087588.

The previous prime is 108131399. The next prime is 108131417. The reversal of 108131409 is 904131801.

It is not a de Polignac number, because 108131409 - 2⁴ = 108131393 is a prime.

It is a super-2 number, since 2×108131409² = 23384803224650562, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 4004867 = 108131409 / (1 + 0 + 8 + 1 + 3 + 1 + 4 + 0 + 9).

It is not an unprimeable number, because it can be changed into a prime (108131449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2002407 + ... + 2002460.

It is an arithmetic number, because the mean of its divisors is an integer number (20024340).

Almost surely, 2^108131409 is an apocalyptic number.

It is an amenable number.

108131409 is a deficient number, since it is larger than the sum of its proper divisors (52063311).

108131409 is an equidigital number, since it uses as much as digits as its factorization.

108131409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4004876 (or 4004870 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 108131409 is about 10398.6253418421. The cubic root of 108131409 is about 476.4133843292.

The spelling of 108131409 in words is "one hundred eight million, one hundred thirty-one thousand, four hundred nine".