868560257 has 2 divisors, whose sum is σ = 868560258. Its totient is φ = 868560256.

The previous prime is 868560241. The next prime is 868560347. The reversal of 868560257 is 752065868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 517972081 + 350588176 = 22759^2 + 18724^2 .

It is a cyclic number.

It is not a de Polignac number, because 868560257 - 2⁴ = 868560241 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (868560227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434280128 + 434280129.

It is an arithmetic number, because the mean of its divisors is an integer number (434280129).

Almost surely, 2^868560257 is an apocalyptic number.

It is an amenable number.

868560257 is a deficient number, since it is larger than the sum of its proper divisors (1).

868560257 is an equidigital number, since it uses as much as digits as its factorization.

868560257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 806400, while the sum is 47.

The square root of 868560257 is about 29471.3463723665. The cubic root of 868560257 is about 954.1133761008.

The spelling of 868560257 in words is "eight hundred sixty-eight million, five hundred sixty thousand, two hundred fifty-seven".