868505837 has 2 divisors, whose sum is σ = 868505838. Its totient is φ = 868505836.

The previous prime is 868505821. The next prime is 868505851. The reversal of 868505837 is 738505868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 821911561 + 46594276 = 28669^2 + 6826^2 .

It is a cyclic number.

It is not a de Polignac number, because 868505837 - 2⁴ = 868505821 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 (868505237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434252918 + 434252919.

It is an arithmetic number, because the mean of its divisors is an integer number (434252919).

Almost surely, 2^868505837 is an apocalyptic number.

It is an amenable number.

868505837 is a deficient number, since it is larger than the sum of its proper divisors (1).

868505837 is an equidigital number, since it uses as much as digits as its factorization.

868505837 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1612800, while the sum is 50.

The square root of 868505837 is about 29470.4230882422. The cubic root of 868505837 is about 954.0934488960.

The spelling of 868505837 in words is "eight hundred sixty-eight million, five hundred five thousand, eight hundred thirty-seven".