108688391 has 8 divisors (see below), whose sum is σ = 127104384. Its totient is φ = 90994680.

The previous prime is 108688373. The next prime is 108688451. The reversal of 108688391 is 193886801.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-108688391 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 (108688091) 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, 180245 + ... + 180846.

It is an arithmetic number, because the mean of its divisors is an integer number (15888048).

Almost surely, 2^108688391 is an apocalyptic number.

108688391 is a deficient number, since it is larger than the sum of its proper divisors (18415993).

108688391 is an equidigital number, since it uses as much as digits as its factorization.

108688391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361141.

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 108688391 is about 10425.3724633703. The cubic root of 108688391 is about 477.2299813799.

The spelling of 108688391 in words is "one hundred eight million, six hundred eighty-eight thousand, three hundred ninety-one".