868761857 has 2 divisors, whose sum is σ = 868761858. Its totient is φ = 868761856.

The previous prime is 868761827. The next prime is 868761989. The reversal of 868761857 is 758167868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 864418801 + 4343056 = 29401^2 + 2084^2 .

It is a cyclic number.

It is not a de Polignac number, because 868761857 - 2⁶ = 868761793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (868761827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434380928 + 434380929.

It is an arithmetic number, because the mean of its divisors is an integer number (434380929).

Almost surely, 2^868761857 is an apocalyptic number.

It is an amenable number.

868761857 is a deficient number, since it is larger than the sum of its proper divisors (1).

868761857 is an equidigital number, since it uses as much as digits as its factorization.

868761857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4515840, while the sum is 56.

The square root of 868761857 is about 29474.7664452155. The cubic root of 868761857 is about 954.1871895850.

The spelling of 868761857 in words is "eight hundred sixty-eight million, seven hundred sixty-one thousand, eight hundred fifty-seven".