117581409 has 16 divisors (see below), whose sum is σ = 190031040. Its totient is φ = 71261280.

The previous prime is 117581389. The next prime is 117581411. The reversal of 117581409 is 904185711.

117581409 is a `hidden beast` number, since 1 + 175 + 81 + 409 = 666.

It is not a de Polignac number, because 117581409 - 2⁵ = 117581377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (117581459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197652 + ... + 198245.

It is an arithmetic number, because the mean of its divisors is an integer number (11876940).

Almost surely, 2^117581409 is an apocalyptic number.

It is an amenable number.

117581409 is a deficient number, since it is larger than the sum of its proper divisors (72449631).

117581409 is a wasteful number, since it uses less digits than its factorization.

117581409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395917 (or 395911 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 36.

The square root of 117581409 is about 10843.4961612941. The cubic root of 117581409 is about 489.9061447340.

The spelling of 117581409 in words is "one hundred seventeen million, five hundred eighty-one thousand, four hundred nine".