12631261 has 2 divisors, whose sum is σ = 12631262. Its totient is φ = 12631260.

The previous prime is 12631237. The next prime is 12631273. The reversal of 12631261 is 16213621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8964036 + 3667225 = 2994^2 + 1915^2 .

It is a cyclic number.

It is not a de Polignac number, because 12631261 - 2¹¹ = 12629213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12631361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6315630 + 6315631.

It is an arithmetic number, because the mean of its divisors is an integer number (6315631).

Almost surely, 2^12631261 is an apocalyptic number.

It is an amenable number.

12631261 is a deficient number, since it is larger than the sum of its proper divisors (1).

12631261 is an equidigital number, since it uses as much as digits as its factorization.

12631261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 22.

The square root of 12631261 is about 3554.0485365284. The cubic root of 12631261 is about 232.8889608264. Note that the first 3 decimals are identical.

Adding to 12631261 its reverse (16213621), we get a palindrome (28844882).

The spelling of 12631261 in words is "twelve million, six hundred thirty-one thousand, two hundred sixty-one".