123130289 has 4 divisors (see below), whose sum is σ = 125453556. Its totient is φ = 120807024.

The previous prime is 123130243. The next prime is 123130327. The reversal of 123130289 is 982031321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31449664 + 91680625 = 5608^2 + 9575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123130289 is a prime.

It is a super-2 number, since 2×123130289² = 30322136138447042, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123130219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1161554 + ... + 1161659.

It is an arithmetic number, because the mean of its divisors is an integer number (31363389).

Almost surely, 2^123130289 is an apocalyptic number.

It is an amenable number.

123130289 is a deficient number, since it is larger than the sum of its proper divisors (2323267).

123130289 is an equidigital number, since it uses as much as digits as its factorization.

123130289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2323266.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 123130289 is about 11096.4088334920. The cubic root of 123130289 is about 497.4945180915.

The spelling of 123130289 in words is "one hundred twenty-three million, one hundred thirty thousand, two hundred eighty-nine".