123136889 has 2 divisors, whose sum is σ = 123136890. Its totient is φ = 123136888.

The previous prime is 123136879. The next prime is 123136901. The reversal of 123136889 is 988631321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93760489 + 29376400 = 9683^2 + 5420^2 .

It is an emirp because it is prime and its reverse (988631321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123136889 - 2⁴ = 123136873 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (123136829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61568444 + 61568445.

It is an arithmetic number, because the mean of its divisors is an integer number (61568445).

Almost surely, 2^123136889 is an apocalyptic number.

It is an amenable number.

123136889 is a deficient number, since it is larger than the sum of its proper divisors (1).

123136889 is an equidigital number, since it uses as much as digits as its factorization.

123136889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 41.

The square root of 123136889 is about 11096.7062230195. The cubic root of 123136889 is about 497.5034067930.

The spelling of 123136889 in words is "one hundred twenty-three million, one hundred thirty-six thousand, eight hundred eighty-nine".