868744861 has 2 divisors, whose sum is σ = 868744862. Its totient is φ = 868744860.

The previous prime is 868744823. The next prime is 868744871. The reversal of 868744861 is 168447868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 491996761 + 376748100 = 22181^2 + 19410^2 .

It is a cyclic number.

It is not a de Polignac number, because 868744861 - 2²⁷ = 734527133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 868744799 and 868744808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (868744801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434372430 + 434372431.

It is an arithmetic number, because the mean of its divisors is an integer number (434372431).

Almost surely, 2^868744861 is an apocalyptic number.

It is an amenable number.

868744861 is a deficient number, since it is larger than the sum of its proper divisors (1).

868744861 is an equidigital number, since it uses as much as digits as its factorization.

868744861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2064384, while the sum is 52.

The square root of 868744861 is about 29474.4781293919. The cubic root of 868744861 is about 954.1809671390.

The spelling of 868744861 in words is "eight hundred sixty-eight million, seven hundred forty-four thousand, eight hundred sixty-one".