12565919 has 2 divisors, whose sum is σ = 12565920. Its totient is φ = 12565918.

The previous prime is 12565871. The next prime is 12565921. The reversal of 12565919 is 91956521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12565919 - 2¹² = 12561823 is a prime.

It is a super-2 number, since 2×12565919² = 315804640629122, which contains 22 as substring.

Together with 12565921, 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 (12565019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6282959 + 6282960.

It is an arithmetic number, because the mean of its divisors is an integer number (6282960).

Almost surely, 2^12565919 is an apocalyptic number.

12565919 is a deficient number, since it is larger than the sum of its proper divisors (1).

12565919 is an equidigital number, since it uses as much as digits as its factorization.

12565919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24300, while the sum is 38.

The square root of 12565919 is about 3544.8440022094. The cubic root of 12565919 is about 232.4866851742.

The spelling of 12565919 in words is "twelve million, five hundred sixty-five thousand, nine hundred nineteen".