1238122861 has 2 divisors, whose sum is σ = 1238122862. Its totient is φ = 1238122860.

The previous prime is 1238122843. The next prime is 1238122883. The reversal of 1238122861 is 1682218321.

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., 1077086761 + 161036100 = 32819^2 + 12690^2 .

It is a cyclic number.

It is not a de Polignac number, because 1238122861 - 2⁵ = 1238122829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1238122261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619061430 + 619061431.

It is an arithmetic number, because the mean of its divisors is an integer number (619061431).

Almost surely, 2^1238122861 is an apocalyptic number.

It is an amenable number.

1238122861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1238122861 is an equidigital number, since it uses as much as digits as its factorization.

1238122861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 34.

The square root of 1238122861 is about 35186.9700457428. The cubic root of 1238122861 is about 1073.7946789182.

The spelling of 1238122861 in words is "one billion, two hundred thirty-eight million, one hundred twenty-two thousand, eight hundred sixty-one".