12619721 has 2 divisors, whose sum is σ = 12619722. Its totient is φ = 12619720.

The previous prime is 12619681. The next prime is 12619757. The reversal of 12619721 is 12791621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7507600 + 5112121 = 2740^2 + 2261^2 .

It is an emirp because it is prime and its reverse (12791621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12619721 - 2¹⁴ = 12603337 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12619121) 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, 6309860 + 6309861.

It is an arithmetic number, because the mean of its divisors is an integer number (6309861).

Almost surely, 2^12619721 is an apocalyptic number.

It is an amenable number.

12619721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12619721 is an equidigital number, since it uses as much as digits as its factorization.

12619721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 29.

The square root of 12619721 is about 3552.4246649296. The cubic root of 12619721 is about 232.8180162740.

The spelling of 12619721 in words is "twelve million, six hundred nineteen thousand, seven hundred twenty-one".