862861 has 2 divisors, whose sum is σ = 862862. Its totient is φ = 862860.

The previous prime is 862819. The next prime is 862879. The reversal of 862861 is 168268.

862861 is nontrivially palindromic in base 3.

862861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 820836 + 42025 = 906^2 + 205^2 .

It is a cyclic number.

It is not a de Polignac number, because 862861 - 2¹¹ = 860813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (862811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431430 + 431431.

It is an arithmetic number, because the mean of its divisors is an integer number (431431).

2⁸⁶²⁸⁶¹ is an apocalyptic number.

It is an amenable number.

862861 is a deficient number, since it is larger than the sum of its proper divisors (1).

862861 is an equidigital number, since it uses as much as digits as its factorization.

862861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 31.

The square root of 862861 is about 928.9031165843. The cubic root of 862861 is about 95.2021917086.

The spelling of 862861 in words is "eight hundred sixty-two thousand, eight hundred sixty-one".