123128317 has 8 divisors (see below), whose sum is σ = 134774360. Its totient is φ = 111792960.

The previous prime is 123128293. The next prime is 123128329. The reversal of 123128317 is 713821321.

It can be written as a sum of positive squares in 4 ways, for example, as 24940036 + 98188281 = 4994^2 + 9909^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123128317 - 2¹⁹ = 122604029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123128347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76842 + ... + 78427.

It is an arithmetic number, because the mean of its divisors is an integer number (16846795).

Almost surely, 2^123128317 is an apocalyptic number.

It is an amenable number.

123128317 is a deficient number, since it is larger than the sum of its proper divisors (11646043).

123128317 is a wasteful number, since it uses less digits than its factorization.

123128317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155343.

The product of its digits is 2016, while the sum is 28.

The square root of 123128317 is about 11096.3199755595. The cubic root of 123128317 is about 497.4918621936.

Adding to 123128317 its reverse (713821321), we get a palindrome (836949638).

The spelling of 123128317 in words is "one hundred twenty-three million, one hundred twenty-eight thousand, three hundred seventeen".