12579991 has 2 divisors, whose sum is σ = 12579992. Its totient is φ = 12579990.

The previous prime is 12579971. The next prime is 12580003. The reversal of 12579991 is 19997521.

It is a strong prime.

It is an emirp because it is prime and its reverse (19997521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12579991 - 2⁷ = 12579863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12579971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6289995 + 6289996.

It is an arithmetic number, because the mean of its divisors is an integer number (6289996).

Almost surely, 2^12579991 is an apocalyptic number.

12579991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12579991 is an equidigital number, since it uses as much as digits as its factorization.

12579991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51030, while the sum is 43.

The square root of 12579991 is about 3546.8283014547. The cubic root of 12579991 is about 232.5734365470.

The spelling of 12579991 in words is "twelve million, five hundred seventy-nine thousand, nine hundred ninety-one".