108991487 has 8 divisors (see below), whose sum is σ = 119010000. Its totient is φ = 98991360.

The previous prime is 108991453. The next prime is 108991499. The reversal of 108991487 is 784199801.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 108991487 - 2¹⁰ = 108990463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108997487) 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, 9773 + ... + 17705.

It is an arithmetic number, because the mean of its divisors is an integer number (14876250).

Almost surely, 2^108991487 is an apocalyptic number.

108991487 is a deficient number, since it is larger than the sum of its proper divisors (10018513).

108991487 is a wasteful number, since it uses less digits than its factorization.

108991487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9193.

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 108991487 is about 10439.8988021915. The cubic root of 108991487 is about 477.6731818847.

The spelling of 108991487 in words is "one hundred eight million, nine hundred ninety-one thousand, four hundred eighty-seven".