108691639 has 8 divisors (see below), whose sum is σ = 125359520. Its totient is φ = 92308896.

The previous prime is 108691637. The next prime is 108691663. The reversal of 108691639 is 936196801.

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 108691639 - 2¹ = 108691637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 108691595 and 108691604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108691631) 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, 70464 + ... + 71989.

It is an arithmetic number, because the mean of its divisors is an integer number (15669940).

Almost surely, 2^108691639 is an apocalyptic number.

108691639 is a deficient number, since it is larger than the sum of its proper divisors (16667881).

108691639 is a wasteful number, since it uses less digits than its factorization.

108691639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142569.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 108691639 is about 10425.5282360176. The cubic root of 108691639 is about 477.2347351153.

The spelling of 108691639 in words is "one hundred eight million, six hundred ninety-one thousand, six hundred thirty-nine".