123128971 has 4 divisors (see below), whose sum is σ = 140718832. Its totient is φ = 105539112.

The previous prime is 123128969. The next prime is 123128989. The reversal of 123128971 is 179821321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 179821321 = 59 ⋅3047819.

It is not a de Polignac number, because 123128971 - 2¹ = 123128969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123128921) 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, 8794920 + ... + 8794933.

It is an arithmetic number, because the mean of its divisors is an integer number (35179708).

Almost surely, 2^123128971 is an apocalyptic number.

123128971 is a deficient number, since it is larger than the sum of its proper divisors (17589861).

123128971 is an equidigital number, since it uses as much as digits as its factorization.

123128971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17589860.

The product of its digits is 6048, while the sum is 34.

The square root of 123128971 is about 11096.3494447498. The cubic root of 123128971 is about 497.4927430067.

The spelling of 123128971 in words is "one hundred twenty-three million, one hundred twenty-eight thousand, nine hundred seventy-one".