108861999 has 8 divisors (see below), whose sum is σ = 153687600. Its totient is φ = 68305536.

The previous prime is 108861997. The next prime is 108862007. The reversal of 108861999 is 999168801.

It is a happy number.

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

It is not a de Polignac number, because 108861999 - 2¹ = 108861997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 2134549 = 108861999 / (1 + 0 + 8 + 8 + 6 + 1 + 9 + 9 + 9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108861997) 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, 1067224 + ... + 1067325.

It is an arithmetic number, because the mean of its divisors is an integer number (19210950).

Almost surely, 2^108861999 is an apocalyptic number.

108861999 is a deficient number, since it is larger than the sum of its proper divisors (44825601).

108861999 is a wasteful number, since it uses less digits than its factorization.

108861999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2134569.

The product of its (nonzero) digits is 279936, while the sum is 51.

The square root of 108861999 is about 10433.6953664557. The cubic root of 108861999 is about 477.4839394103.

The spelling of 108861999 in words is "one hundred eight million, eight hundred sixty-one thousand, nine hundred ninety-nine".