108171987 has 16 divisors (see below), whose sum is σ = 179818752. Its totient is φ = 56193120.

The previous prime is 108171983. The next prime is 108172033. The reversal of 108171987 is 789171801.

It is a happy number.

It is not a de Polignac number, because 108171987 - 2² = 108171983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (108171983) 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, 233908 + ... + 234369.

It is an arithmetic number, because the mean of its divisors is an integer number (11238672).

Almost surely, 2^108171987 is an apocalyptic number.

108171987 is a deficient number, since it is larger than the sum of its proper divisors (71646765).

108171987 is a wasteful number, since it uses less digits than its factorization.

108171987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468298.

The product of its (nonzero) digits is 28224, while the sum is 42.

The square root of 108171987 is about 10400.5762821105. The cubic root of 108171987 is about 476.4729707305.

Multiplying 108171987 by its sum of digits (42), we get a palindrome (4543223454).

The spelling of 108171987 in words is "one hundred eight million, one hundred seventy-one thousand, nine hundred eighty-seven".