868061861 has 2 divisors, whose sum is σ = 868061862. Its totient is φ = 868061860.

The previous prime is 868061851. The next prime is 868061869. The reversal of 868061861 is 168160868.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 835788100 + 32273761 = 28910^2 + 5681^2 .

It is a cyclic number.

It is not a de Polignac number, because 868061861 - 2¹⁸ = 867799717 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (868061869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434030930 + 434030931.

It is an arithmetic number, because the mean of its divisors is an integer number (434030931).

Almost surely, 2^868061861 is an apocalyptic number.

It is an amenable number.

868061861 is a deficient number, since it is larger than the sum of its proper divisors (1).

868061861 is an equidigital number, since it uses as much as digits as its factorization.

868061861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 868061861 is about 29462.8895561858. The cubic root of 868061861 is about 953.9308451938.

The spelling of 868061861 in words is "eight hundred sixty-eight million, sixty-one thousand, eight hundred sixty-one".