117581087 has 4 divisors (see below), whose sum is σ = 126625800. Its totient is φ = 108536376.

The previous prime is 117581077. The next prime is 117581089. The reversal of 117581087 is 780185711.

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

It is not a de Polignac number, because 117581087 - 2¹⁴ = 117564703 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 117581087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117581089) 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, 4522337 + ... + 4522362.

It is an arithmetic number, because the mean of its divisors is an integer number (31656450).

Almost surely, 2^117581087 is an apocalyptic number.

117581087 is a deficient number, since it is larger than the sum of its proper divisors (9044713).

117581087 is an equidigital number, since it uses as much as digits as its factorization.

117581087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9044712.

The product of its (nonzero) digits is 15680, while the sum is 38.

The square root of 117581087 is about 10843.4813136741. The cubic root of 117581087 is about 489.9056975263.

The spelling of 117581087 in words is "one hundred seventeen million, five hundred eighty-one thousand, eighty-seven".