108685931 has 2 divisors, whose sum is σ = 108685932. Its totient is φ = 108685930.

The previous prime is 108685903. The next prime is 108685933. The reversal of 108685931 is 139586801.

It is a strong prime.

It is an emirp because it is prime and its reverse (139586801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 108685931 - 2¹⁰ = 108684907 is a prime.

It is a super-2 number, since 2×108685931² = 23625263194673522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 108685933, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (108685933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54342965 + 54342966.

It is an arithmetic number, because the mean of its divisors is an integer number (54342966).

Almost surely, 2^108685931 is an apocalyptic number.

108685931 is a deficient number, since it is larger than the sum of its proper divisors (1).

108685931 is an equidigital number, since it uses as much as digits as its factorization.

108685931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 108685931 is about 10425.2544813064. The cubic root of 108685931 is about 477.2263808893.

The spelling of 108685931 in words is "one hundred eight million, six hundred eighty-five thousand, nine hundred thirty-one".