12628531 has 4 divisors (see below), whose sum is σ = 12725064. Its totient is φ = 12532000.

The previous prime is 12628513. The next prime is 12628547. The reversal of 12628531 is 13582621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12628531 - 2⁹ = 12628019 is a prime.

It is a super-2 number, since 2×12628531² = 318959590435922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12628531.

It is not an unprimeable number, because it can be changed into a prime (12628591) 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, 48070 + ... + 48331.

It is an arithmetic number, because the mean of its divisors is an integer number (3181266).

Almost surely, 2^12628531 is an apocalyptic number.

12628531 is a deficient number, since it is larger than the sum of its proper divisors (96533).

12628531 is an equidigital number, since it uses as much as digits as its factorization.

12628531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96532.

The product of its digits is 2880, while the sum is 28.

The square root of 12628531 is about 3553.6644467366. The cubic root of 12628531 is about 232.8721814863.

The spelling of 12628531 in words is "twelve million, six hundred twenty-eight thousand, five hundred thirty-one".