12509131 has 2 divisors, whose sum is σ = 12509132. Its totient is φ = 12509130.

The previous prime is 12509129. The next prime is 12509143. The reversal of 12509131 is 13190521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12509131 - 2¹ = 12509129 is a prime.

It is a super-2 number, since 2×12509131² = 312956716750322, which contains 22 as substring.

Together with 12509129, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12509531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6254565 + 6254566.

It is an arithmetic number, because the mean of its divisors is an integer number (6254566).

Almost surely, 2^12509131 is an apocalyptic number.

12509131 is a deficient number, since it is larger than the sum of its proper divisors (1).

12509131 is an equidigital number, since it uses as much as digits as its factorization.

12509131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 12509131 is about 3536.8249886021. The cubic root of 12509131 is about 232.1359377233.

Adding to 12509131 its reverse (13190521), we get a palindrome (25699652).

The spelling of 12509131 in words is "twelve million, five hundred nine thousand, one hundred thirty-one".