861365159 has 4 divisors (see below), whose sum is σ = 862541016. Its totient is φ = 860189304.

The previous prime is 861365149. The next prime is 861365173. The reversal of 861365159 is 951563168.

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 861365159 - 2²⁸ = 592929703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861365149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 586829 + ... + 588294.

It is an arithmetic number, because the mean of its divisors is an integer number (215635254).

Almost surely, 2^861365159 is an apocalyptic number.

861365159 is a deficient number, since it is larger than the sum of its proper divisors (1175857).

861365159 is a wasteful number, since it uses less digits than its factorization.

861365159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175856.

The product of its digits is 194400, while the sum is 44.

The square root of 861365159 is about 29349.0231353618. The cubic root of 861365159 is about 951.4714625994.

The spelling of 861365159 in words is "eight hundred sixty-one million, three hundred sixty-five thousand, one hundred fifty-nine".