8686812389 has 2 divisors, whose sum is σ = 8686812390. Its totient is φ = 8686812388.

The previous prime is 8686812383. The next prime is 8686812403. The reversal of 8686812389 is 9832186868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7128931489 + 1557880900 = 84433^2 + 39470^2 .

It is a cyclic number.

It is not a de Polignac number, because 8686812389 - 2⁴ = 8686812373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8686812383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4343406194 + 4343406195.

It is an arithmetic number, because the mean of its divisors is an integer number (4343406195).

Almost surely, 2^8686812389 is an apocalyptic number.

It is an amenable number.

8686812389 is a deficient number, since it is larger than the sum of its proper divisors (1).

8686812389 is an equidigital number, since it uses as much as digits as its factorization.

8686812389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7962624, while the sum is 59.

The square root of 8686812389 is about 93203.0707058517. The cubic root of 8686812389 is about 2055.6703917210.

The spelling of 8686812389 in words is "eight billion, six hundred eighty-six million, eight hundred twelve thousand, three hundred eighty-nine".