12721519 has 2 divisors, whose sum is σ = 12721520. Its totient is φ = 12721518.

The previous prime is 12721477. The next prime is 12721523. The reversal of 12721519 is 91512721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12721519 - 2⁷ = 12721391 is a prime.

It is a super-2 number, since 2×12721519² = 323674091334722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12721529) 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, 6360759 + 6360760.

It is an arithmetic number, because the mean of its divisors is an integer number (6360760).

Almost surely, 2^12721519 is an apocalyptic number.

12721519 is a deficient number, since it is larger than the sum of its proper divisors (1).

12721519 is an equidigital number, since it uses as much as digits as its factorization.

12721519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 28.

The square root of 12721519 is about 3566.7238468937. The cubic root of 12721519 is about 233.4423556286.

The spelling of 12721519 in words is "twelve million, seven hundred twenty-one thousand, five hundred nineteen".