100639085 has 4 divisors (see below), whose sum is σ = 120766908. Its totient is φ = 80511264.

The previous prime is 100639061. The next prime is 100639111. The reversal of 100639085 is 580936001.

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 22458121 + 78180964 = 4739^2 + 8842^2 .

It is a cyclic number.

It is not a de Polignac number, because 100639085 - 2¹⁴ = 100622701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10063904 + ... + 10063913.

It is an arithmetic number, because the mean of its divisors is an integer number (30191727).

Almost surely, 2^100639085 is an apocalyptic number.

It is an amenable number.

100639085 is a deficient number, since it is larger than the sum of its proper divisors (20127823).

100639085 is an equidigital number, since it uses as much as digits as its factorization.

100639085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20127822.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 100639085 is about 10031.9033587849. The cubic root of 100639085 is about 465.1455743388.

The spelling of 100639085 in words is "one hundred million, six hundred thirty-nine thousand, eighty-five".