12519581 has 2 divisors, whose sum is σ = 12519582. Its totient is φ = 12519580.

The previous prime is 12519571. The next prime is 12519583. The reversal of 12519581 is 18591521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8213956 + 4305625 = 2866^2 + 2075^2 .

It is a cyclic number.

It is not a de Polignac number, because 12519581 - 2⁶ = 12519517 is a prime.

It is a super-2 number, since 2×12519581² = 313479816831122, which contains 22 as substring.

Together with 12519583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12519583) 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, 6259790 + 6259791.

It is an arithmetic number, because the mean of its divisors is an integer number (6259791).

Almost surely, 2^12519581 is an apocalyptic number.

It is an amenable number.

12519581 is a deficient number, since it is larger than the sum of its proper divisors (1).

12519581 is an equidigital number, since it uses as much as digits as its factorization.

12519581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 32.

The square root of 12519581 is about 3538.3019938948. The cubic root of 12519581 is about 232.2005610602.

The spelling of 12519581 in words is "twelve million, five hundred nineteen thousand, five hundred eighty-one".