868122691 has 2 divisors, whose sum is σ = 868122692. Its totient is φ = 868122690.

The previous prime is 868122677. The next prime is 868122727. The reversal of 868122691 is 196221868.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 868122691 - 2²⁹ = 331251779 is a prime.

It is not a weakly prime, because it can be changed into another prime (868122611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434061345 + 434061346.

It is an arithmetic number, because the mean of its divisors is an integer number (434061346).

Almost surely, 2^868122691 is an apocalyptic number.

868122691 is a deficient number, since it is larger than the sum of its proper divisors (1).

868122691 is an equidigital number, since it uses as much as digits as its factorization.

868122691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 43.

The square root of 868122691 is about 29463.9218536840. The cubic root of 868122691 is about 953.9531271150.

The spelling of 868122691 in words is "eight hundred sixty-eight million, one hundred twenty-two thousand, six hundred ninety-one".