861315 has 32 divisors (see below), whose sum is σ = 1698816. Its totient is φ = 362880.

The previous prime is 861299. The next prime is 861317. The reversal of 861315 is 513168.

It is not a de Polignac number, because 861315 - 2⁴ = 861299 is a prime.

861315 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (861317) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1050 + ... + 1680.

It is an arithmetic number, because the mean of its divisors is an integer number (53088).

2⁸⁶¹³¹⁵ is an apocalyptic number.

861315 is a deficient number, since it is larger than the sum of its proper divisors (837501).

861315 is a wasteful number, since it uses less digits than its factorization.

861315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659.

The product of its digits is 720, while the sum is 24.

The square root of 861315 is about 928.0705792126. The cubic root of 861315 is about 95.1452993551.

It can be divided in two parts, 861 and 315, that added together give a triangular number (1176 = T₄₈).

The spelling of 861315 in words is "eight hundred sixty-one thousand, three hundred fifteen".