861912085 has 16 divisors (see below), whose sum is σ = 1057430016. Its totient is φ = 674137728.

The previous prime is 861912013. The next prime is 861912113. The reversal of 861912085 is 580219168.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861912085 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 15 ways as a sum of consecutive naturals, for example, 361417 + ... + 363793.

It is an arithmetic number, because the mean of its divisors is an integer number (66089376).

Almost surely, 2^861912085 is an apocalyptic number.

It is an amenable number.

861912085 is a deficient number, since it is larger than the sum of its proper divisors (195517931).

861912085 is a wasteful number, since it uses less digits than its factorization.

861912085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3972.

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 861912085 is about 29358.3392752383. The cubic root of 861912085 is about 951.6727997345.

The spelling of 861912085 in words is "eight hundred sixty-one million, nine hundred twelve thousand, eighty-five".