868511513 has 2 divisors, whose sum is σ = 868511514. Its totient is φ = 868511512.

The previous prime is 868511509. The next prime is 868511537. The reversal of 868511513 is 315115868.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 854275984 + 14235529 = 29228^2 + 3773^2 .

It is a cyclic number.

It is not a de Polignac number, because 868511513 - 2² = 868511509 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (868511503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434255756 + 434255757.

It is an arithmetic number, because the mean of its divisors is an integer number (434255757).

Almost surely, 2^868511513 is an apocalyptic number.

It is an amenable number.

868511513 is a deficient number, since it is larger than the sum of its proper divisors (1).

868511513 is an equidigital number, since it uses as much as digits as its factorization.

868511513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 38.

The square root of 868511513 is about 29470.5193880257. The cubic root of 868511513 is about 954.0955273401.

The spelling of 868511513 in words is "eight hundred sixty-eight million, five hundred eleven thousand, five hundred thirteen".