100685857 has 4 divisors (see below), whose sum is σ = 101003796. Its totient is φ = 100367920.

The previous prime is 100685839. The next prime is 100685947. The reversal of 100685857 is 758586001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 758586001 = 19 ⋅39925579.

It can be written as a sum of positive squares in 2 ways, for example, as 9979281 + 90706576 = 3159^2 + 9524^2 .

It is a cyclic number.

It is not a de Polignac number, because 100685857 - 2⁷ = 100685729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100685357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158494 + ... + 159127.

It is an arithmetic number, because the mean of its divisors is an integer number (25250949).

Almost surely, 2^100685857 is an apocalyptic number.

It is an amenable number.

100685857 is a deficient number, since it is larger than the sum of its proper divisors (317939).

100685857 is an equidigital number, since it uses as much as digits as its factorization.

100685857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317938.

The product of its (nonzero) digits is 67200, while the sum is 40.

The square root of 100685857 is about 10034.2342508036. The cubic root of 100685857 is about 465.2176219578.

The spelling of 100685857 in words is "one hundred million, six hundred eighty-five thousand, eight hundred fifty-seven".