12491443 has 2 divisors, whose sum is σ = 12491444. Its totient is φ = 12491442.

The previous prime is 12491399. The next prime is 12491449. The reversal of 12491443 is 34419421.

It is a strong prime.

It is an emirp because it is prime and its reverse (34419421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12491443 - 2⁹ = 12490931 is a prime.

It is a super-2 number, since 2×12491443² = 312072296444498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12491449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6245721 + 6245722.

It is an arithmetic number, because the mean of its divisors is an integer number (6245722).

Almost surely, 2^12491443 is an apocalyptic number.

12491443 is a deficient number, since it is larger than the sum of its proper divisors (1).

12491443 is an equidigital number, since it uses as much as digits as its factorization.

12491443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 12491443 is about 3534.3235562127. The cubic root of 12491443 is about 232.0264721577.

The spelling of 12491443 in words is "twelve million, four hundred ninety-one thousand, four hundred forty-three".