12991513 has 2 divisors, whose sum is σ = 12991514. Its totient is φ = 12991512.

The previous prime is 12991499. The next prime is 12991523. The reversal of 12991513 is 31519921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12194064 + 797449 = 3492^2 + 893^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12991513 is a prime.

It is not a weakly prime, because it can be changed into another prime (12991523) 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 as a sum of consecutive naturals, namely, 6495756 + 6495757.

It is an arithmetic number, because the mean of its divisors is an integer number (6495757).

Almost surely, 2^12991513 is an apocalyptic number.

It is an amenable number.

12991513 is a deficient number, since it is larger than the sum of its proper divisors (1).

12991513 is an equidigital number, since it uses as much as digits as its factorization.

12991513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2430, while the sum is 31.

The square root of 12991513 is about 3604.3741481705. The cubic root of 12991513 is about 235.0822889727.

The spelling of 12991513 in words is "twelve million, nine hundred ninety-one thousand, five hundred thirteen".