12991252 has 6 divisors (see below), whose sum is σ = 22734698. Its totient is φ = 6495624.

The previous prime is 12991249. The next prime is 12991261. The reversal of 12991252 is 25219921.

It can be written as a sum of positive squares in only one way, i.e., 12152196 + 839056 = 3486^2 + 916^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1623903 + ... + 1623910.

Almost surely, 2^12991252 is an apocalyptic number.

It is an amenable number.

12991252 is a deficient number, since it is larger than the sum of its proper divisors (9743446).

12991252 is a wasteful number, since it uses less digits than its factorization.

12991252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3247817 (or 3247815 counting only the distinct ones).

The product of its digits is 3240, while the sum is 31.

The square root of 12991252 is about 3604.3379419805. The cubic root of 12991252 is about 235.0807146914.

The spelling of 12991252 in words is "twelve million, nine hundred ninety-one thousand, two hundred fifty-two".