123159789 has 6 divisors (see below), whose sum is σ = 177897486. Its totient is φ = 82106520.

The previous prime is 123159763. The next prime is 123159809. The reversal of 123159789 is 987951321.

It can be written as a sum of positive squares in only one way, i.e., 83997225 + 39162564 = 9165^2 + 6258^2 .

It is not a de Polignac number, because 123159789 - 2⁹ = 123159277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123159709) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6842202 + ... + 6842219.

It is an arithmetic number, because the mean of its divisors is an integer number (29649581).

Almost surely, 2^123159789 is an apocalyptic number.

It is an amenable number.

123159789 is a deficient number, since it is larger than the sum of its proper divisors (54737697).

123159789 is a wasteful number, since it uses less digits than its factorization.

123159789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13684427 (or 13684424 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 123159789 is about 11097.7380127664. The cubic root of 123159789 is about 497.5342454310.

The spelling of 123159789 in words is "one hundred twenty-three million, one hundred fifty-nine thousand, seven hundred eighty-nine".