861365031 has 4 divisors (see below), whose sum is σ = 1148486712. Its totient is φ = 574243352.

The previous prime is 861365003. The next prime is 861365041. The reversal of 861365031 is 130563168.

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

It is a cyclic number.

It is not a de Polignac number, because 861365031 - 2¹⁷ = 861233959 is a prime.

It is a super-2 number, since 2×861365031² = 1483899433259261922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 861364983 and 861365001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861365041) 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, 143560836 + ... + 143560841.

It is an arithmetic number, because the mean of its divisors is an integer number (287121678).

Almost surely, 2^861365031 is an apocalyptic number.

861365031 is a deficient number, since it is larger than the sum of its proper divisors (287121681).

861365031 is a wasteful number, since it uses less digits than its factorization.

861365031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287121680.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 861365031 is about 29349.0209547099. The cubic root of 861365031 is about 951.4714154694.

The spelling of 861365031 in words is "eight hundred sixty-one million, three hundred sixty-five thousand, thirty-one".