12125831 has 4 divisors (see below), whose sum is σ = 12132912. Its totient is φ = 12118752.

The previous prime is 12125809. The next prime is 12125837. The reversal of 12125831 is 13852121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13852121 = 19 ⋅729059.

It is a cyclic number.

It is not a de Polignac number, because 12125831 - 2⁶ = 12125767 is a prime.

It is a super-2 number, since 2×12125831² = 294071554881122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12125797 and 12125806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12125837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 815 + ... + 4991.

It is an arithmetic number, because the mean of its divisors is an integer number (3033228).

Almost surely, 2^12125831 is an apocalyptic number.

12125831 is a deficient number, since it is larger than the sum of its proper divisors (7081).

12125831 is an equidigital number, since it uses as much as digits as its factorization.

12125831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7080.

The product of its digits is 480, while the sum is 23.

The square root of 12125831 is about 3482.2163918976. The cubic root of 12125831 is about 229.7402928704.

Adding to 12125831 its reverse (13852121), we get a palindrome (25977952).

It can be divided in two parts, 121 and 25831, that added together give a palindrome (25952).

The spelling of 12125831 in words is "twelve million, one hundred twenty-five thousand, eight hundred thirty-one".