861481685 has 8 divisors (see below), whose sum is σ = 1069425720. Its totient is φ = 665420224.

The previous prime is 861481669. The next prime is 861481703. The reversal of 861481685 is 586184168.

It can be written as a sum of positive squares in 4 ways, for example, as 484 + 861481201 = 22^2 + 29351^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 861481685 - 2⁴ = 861481669 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2970482 + ... + 2970771.

It is an arithmetic number, because the mean of its divisors is an integer number (133678215).

Almost surely, 2^861481685 is an apocalyptic number.

It is an amenable number.

861481685 is a deficient number, since it is larger than the sum of its proper divisors (207944035).

861481685 is a wasteful number, since it uses less digits than its factorization.

861481685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5941287.

The product of its digits is 368640, while the sum is 47.

The square root of 861481685 is about 29351.0082450331. The cubic root of 861481685 is about 951.5143658765.

The spelling of 861481685 in words is "eight hundred sixty-one million, four hundred eighty-one thousand, six hundred eighty-five".