861081 has 8 divisors (see below), whose sum is σ = 1236480. Its totient is φ = 529872.

The previous prime is 861079. The next prime is 861083. The reversal of 861081 is 180168.

861081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (861079) and next prime (861083).

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

It is not a de Polignac number, because 861081 - 2¹ = 861079 is a prime.

It is a super-2 number, since 2×861081² = 1482920977122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (861083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11001 + ... + 11078.

It is an arithmetic number, because the mean of its divisors is an integer number (154560).

2⁸⁶¹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

861081 is a deficient number, since it is larger than the sum of its proper divisors (375399).

861081 is a wasteful number, since it uses less digits than its factorization.

861081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22095.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 861081 is about 927.9445026509. The cubic root of 861081 is about 95.1366822922.

The spelling of 861081 in words is "eight hundred sixty-one thousand, eighty-one".