861159 has 16 divisors (see below), whose sum is σ = 1257984. Its totient is φ = 520800.

The previous prime is 861139. The next prime is 861163. The reversal of 861159 is 951168.

It is a happy number.

It is not a de Polignac number, because 861159 - 2⁷ = 861031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2614 + ... + 2924.

It is an arithmetic number, because the mean of its divisors is an integer number (78624).

2⁸⁶¹¹⁵⁹ is an apocalyptic number.

861159 is a deficient number, since it is larger than the sum of its proper divisors (396825).

861159 is a wasteful number, since it uses less digits than its factorization.

861159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398.

The product of its digits is 2160, while the sum is 30.

The square root of 861159 is about 927.9865300747. The cubic root of 861159 is about 95.1395548200.

Subtracting 861159 from its reverse (951168), we obtain a palindrome (90009).

The spelling of 861159 in words is "eight hundred sixty-one thousand, one hundred fifty-nine".