12451919 has 2 divisors, whose sum is σ = 12451920. Its totient is φ = 12451918.

The previous prime is 12451903. The next prime is 12451921. The reversal of 12451919 is 91915421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12451919 - 2⁴ = 12451903 is a prime.

It is a super-2 number, since 2×12451919² = 310100573565122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 12451921, 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 (12451949) 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, 6225959 + 6225960.

It is an arithmetic number, because the mean of its divisors is an integer number (6225960).

Almost surely, 2^12451919 is an apocalyptic number.

12451919 is a deficient number, since it is larger than the sum of its proper divisors (1).

12451919 is an equidigital number, since it uses as much as digits as its factorization.

12451919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 32.

The square root of 12451919 is about 3528.7276743892. The cubic root of 12451919 is about 231.7814963630.

The spelling of 12451919 in words is "twelve million, four hundred fifty-one thousand, nine hundred nineteen".