102109985 has 4 divisors (see below), whose sum is σ = 122531988. Its totient is φ = 81687984.

The previous prime is 102109961. The next prime is 102110023. The reversal of 102109985 is 589901201.

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 21613201 + 80496784 = 4649^2 + 8972^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102109985 is a prime.

It is a Duffinian 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, 10210994 + ... + 10211003.

It is an arithmetic number, because the mean of its divisors is an integer number (30632997).

Almost surely, 2^102109985 is an apocalyptic number.

It is an amenable number.

102109985 is a deficient number, since it is larger than the sum of its proper divisors (20422003).

102109985 is an equidigital number, since it uses as much as digits as its factorization.

102109985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20422002.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 102109985 is about 10104.9485401955. The cubic root of 102109985 is about 467.4007491364.

The spelling of 102109985 in words is "one hundred two million, one hundred nine thousand, nine hundred eighty-five".