861000681 has 4 divisors (see below), whose sum is σ = 1148000912. Its totient is φ = 574000452.

The previous prime is 861000677. The next prime is 861000703. The reversal of 861000681 is 186000168.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 861000681 - 2² = 861000677 is a prime.

It is a super-2 number, since 2×861000681² = 1482644345364927522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (861000631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143500111 + ... + 143500116.

It is an arithmetic number, because the mean of its divisors is an integer number (287000228).

Almost surely, 2^861000681 is an apocalyptic number.

It is an amenable number.

861000681 is a deficient number, since it is larger than the sum of its proper divisors (287000231).

861000681 is a wasteful number, since it uses less digits than its factorization.

861000681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287000230.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 861000681 is about 29342.8131064491. The cubic root of 861000681 is about 951.3372418076.

The spelling of 861000681 in words is "eight hundred sixty-one million, six hundred eighty-one", and thus it is an aban number.