108689257 has 4 divisors (see below), whose sum is σ = 108717700. Its totient is φ = 108660816.

The previous prime is 108689201. The next prime is 108689261. The reversal of 108689257 is 752986801.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 91183401 + 17505856 = 9549^2 + 4184^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-108689257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108689657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7398 + ... + 16495.

It is an arithmetic number, because the mean of its divisors is an integer number (27179425).

Almost surely, 2^108689257 is an apocalyptic number.

It is an amenable number.

108689257 is a deficient number, since it is larger than the sum of its proper divisors (28443).

108689257 is an equidigital number, since it uses as much as digits as its factorization.

108689257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28442.

The product of its (nonzero) digits is 241920, while the sum is 46.

The square root of 108689257 is about 10425.4139965759. The cubic root of 108689257 is about 477.2312488568.

The spelling of 108689257 in words is "one hundred eight million, six hundred eighty-nine thousand, two hundred fifty-seven".