123128237 has 2 divisors, whose sum is σ = 123128238. Its totient is φ = 123128236.

The previous prime is 123128233. The next prime is 123128251. The reversal of 123128237 is 732821321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119552356 + 3575881 = 10934^2 + 1891^2 .

It is a cyclic number.

It is not a de Polignac number, because 123128237 - 2² = 123128233 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123128231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61564118 + 61564119.

It is an arithmetic number, because the mean of its divisors is an integer number (61564119).

Almost surely, 2^123128237 is an apocalyptic number.

It is an amenable number.

123128237 is a deficient number, since it is larger than the sum of its proper divisors (1).

123128237 is an equidigital number, since it uses as much as digits as its factorization.

123128237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 29.

The square root of 123128237 is about 11096.3163707602. The cubic root of 123128237 is about 497.4917544487.

Adding to 123128237 its reverse (732821321), we get a palindrome (855949558).

The spelling of 123128237 in words is "one hundred twenty-three million, one hundred twenty-eight thousand, two hundred thirty-seven".