861115 has 4 divisors (see below), whose sum is σ = 1033344. Its totient is φ = 688888.

The previous prime is 861109. The next prime is 861121. The reversal of 861115 is 511168.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (861109) and next prime (861121).

It is a cyclic number.

It is not a de Polignac number, because 861115 - 2⁵ = 861083 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 86107 + ... + 86116.

It is an arithmetic number, because the mean of its divisors is an integer number (258336).

2⁸⁶¹¹¹⁵ is an apocalyptic number.

861115 is a deficient number, since it is larger than the sum of its proper divisors (172229).

861115 is a wasteful number, since it uses less digits than its factorization.

861115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172228.

The product of its digits is 240, while the sum is 22.

The square root of 861115 is about 927.9628225312. The cubic root of 861115 is about 95.1379344410.

The spelling of 861115 in words is "eight hundred sixty-one thousand, one hundred fifteen".