868617749 has 2 divisors, whose sum is σ = 868617750. Its totient is φ = 868617748.

The previous prime is 868617707. The next prime is 868617797. The reversal of 868617749 is 947716868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 444999025 + 423618724 = 21095^2 + 20582^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-868617749 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 868617694 and 868617703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (868617049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434308874 + 434308875.

It is an arithmetic number, because the mean of its divisors is an integer number (434308875).

Almost surely, 2^868617749 is an apocalyptic number.

It is an amenable number.

868617749 is a deficient number, since it is larger than the sum of its proper divisors (1).

868617749 is an equidigital number, since it uses as much as digits as its factorization.

868617749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 56.

The square root of 868617749 is about 29472.3217443078. The cubic root of 868617749 is about 954.1344272888.

The spelling of 868617749 in words is "eight hundred sixty-eight million, six hundred seventeen thousand, seven hundred forty-nine".