12511131 has 4 divisors (see below), whose sum is σ = 16681512. Its totient is φ = 8340752.

The previous prime is 12511117. The next prime is 12511141. The reversal of 12511131 is 13111521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13111521 = 3 ⋅4370507.

It is a cyclic number.

It is not a de Polignac number, because 12511131 - 2⁷ = 12511003 is a prime.

It is a super-2 number, since 2×12511131² = 313056797798322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12511131.

It is not an unprimeable number, because it can be changed into a prime (12511141) 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 3 ways as a sum of consecutive naturals, for example, 2085186 + ... + 2085191.

It is an arithmetic number, because the mean of its divisors is an integer number (4170378).

Almost surely, 2^12511131 is an apocalyptic number.

12511131 is a deficient number, since it is larger than the sum of its proper divisors (4170381).

12511131 is an equidigital number, since it uses as much as digits as its factorization.

12511131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4170380.

The product of its digits is 30, while the sum is 15.

The square root of 12511131 is about 3537.1077167652. The cubic root of 12511131 is about 232.1483086102.

Adding to 12511131 its reverse (13111521), we get a palindrome (25622652).

The spelling of 12511131 in words is "twelve million, five hundred eleven thousand, one hundred thirty-one".