12128537 has 4 divisors (see below), whose sum is σ = 12410640. Its totient is φ = 11846436.

The previous prime is 12128513. The next prime is 12128561. The reversal of 12128537 is 73582121.

12128537 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

12128537 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (12128513) and next prime (12128561).

It is a cyclic number.

It is not a de Polignac number, because 12128537 - 2¹⁶ = 12063001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12128507) 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, 140987 + ... + 141072.

It is an arithmetic number, because the mean of its divisors is an integer number (3102660).

Almost surely, 2^12128537 is an apocalyptic number.

It is an amenable number.

12128537 is a deficient number, since it is larger than the sum of its proper divisors (282103).

12128537 is an equidigital number, since it uses as much as digits as its factorization.

12128537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282102.

The product of its digits is 3360, while the sum is 29.

The square root of 12128537 is about 3482.6049158640. The cubic root of 12128537 is about 229.7573812111.

The spelling of 12128537 in words is "twelve million, one hundred twenty-eight thousand, five hundred thirty-seven".