12516231 has 48 divisors (see below), whose sum is σ = 21848064. Its totient is φ = 6205248.

The previous prime is 12516227. The next prime is 12516247. The reversal of 12516231 is 13261521.

12516231 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12516231 - 2² = 12516227 is a prime.

It is a super-2 number, since 2×12516231² = 313312076890722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 12516198 and 12516207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12516211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 98490 + ... + 98616.

It is an arithmetic number, because the mean of its divisors is an integer number (455168).

Almost surely, 2^12516231 is an apocalyptic number.

12516231 is a deficient number, since it is larger than the sum of its proper divisors (9331833).

12516231 is a wasteful number, since it uses less digits than its factorization.

12516231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188 (or 169 counting only the distinct ones).

The product of its digits is 360, while the sum is 21.

The square root of 12516231 is about 3537.8285713132. The cubic root of 12516231 is about 232.1798484056.

Adding to 12516231 its reverse (13261521), we get a palindrome (25777752).

The spelling of 12516231 in words is "twelve million, five hundred sixteen thousand, two hundred thirty-one".