861359 has 4 divisors (see below), whose sum is σ = 866016. Its totient is φ = 856704.

The previous prime is 861353. The next prime is 861361. The reversal of 861359 is 953168.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 861359.

It is not an unprimeable number, because it can be changed into a prime (861353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2039 + ... + 2424.

It is an arithmetic number, because the mean of its divisors is an integer number (216504).

2⁸⁶¹³⁵⁹ is an apocalyptic number.

861359 is a deficient number, since it is larger than the sum of its proper divisors (4657).

861359 is a wasteful number, since it uses less digits than its factorization.

861359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4656.

The product of its digits is 6480, while the sum is 32.

The square root of 861359 is about 928.0942840035. The cubic root of 861359 is about 95.1469194832.

Subtracting 861359 from its reverse (953168), we obtain a square (91809 = 303²).

The spelling of 861359 in words is "eight hundred sixty-one thousand, three hundred fifty-nine".