12128957 has 2 divisors, whose sum is σ = 12128958. Its totient is φ = 12128956.

The previous prime is 12128947. The next prime is 12128959. The reversal of 12128957 is 75982121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10023556 + 2105401 = 3166^2 + 1451^2 .

It is a cyclic number.

It is not a de Polignac number, because 12128957 - 2²² = 7934653 is a prime.

It is a super-2 number, since 2×12128957² = 294223195815698, which contains 22 as substring.

Together with 12128959, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₇₉₅₉₅₀ and since 12128957 and 795950 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12128959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6064478 + 6064479.

It is an arithmetic number, because the mean of its divisors is an integer number (6064479).

Almost surely, 2^12128957 is an apocalyptic number.

It is an amenable number.

12128957 is a deficient number, since it is larger than the sum of its proper divisors (1).

12128957 is an equidigital number, since it uses as much as digits as its factorization.

12128957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 35.

The square root of 12128957 is about 3482.6652150329. The cubic root of 12128957 is about 229.7600332756.

The spelling of 12128957 in words is "twelve million, one hundred twenty-eight thousand, nine hundred fifty-seven".