12131257 has 2 divisors, whose sum is σ = 12131258. Its totient is φ = 12131256.

The previous prime is 12131219. The next prime is 12131267. The reversal of 12131257 is 75213121.

It is a happy number.

12131257 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6270016 + 5861241 = 2504^2 + 2421^2 .

It is a cyclic number.

It is not a de Polignac number, because 12131257 - 2²³ = 3742649 is a prime.

It is not a weakly prime, because it can be changed into another prime (12131267) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6065628 + 6065629.

It is an arithmetic number, because the mean of its divisors is an integer number (6065629).

Almost surely, 2^12131257 is an apocalyptic number.

It is an amenable number.

12131257 is a deficient number, since it is larger than the sum of its proper divisors (1).

12131257 is an equidigital number, since it uses as much as digits as its factorization.

12131257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 22.

The square root of 12131257 is about 3482.9954062559. The cubic root of 12131257 is about 229.7745554003.

Adding to 12131257 its reverse (75213121), we get a palindrome (87344378).

The spelling of 12131257 in words is "twelve million, one hundred thirty-one thousand, two hundred fifty-seven".