12509779 has 2 divisors, whose sum is σ = 12509780. Its totient is φ = 12509778.

The previous prime is 12509753. The next prime is 12509813. The reversal of 12509779 is 97790521.

It is a weak prime.

It is an emirp because it is prime and its reverse (97790521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12509779 - 2⁵ = 12509747 is a prime.

It is not a weakly prime, because it can be changed into another prime (12509719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6254889 + 6254890.

It is an arithmetic number, because the mean of its divisors is an integer number (6254890).

Almost surely, 2^12509779 is an apocalyptic number.

12509779 is a deficient number, since it is larger than the sum of its proper divisors (1).

12509779 is an equidigital number, since it uses as much as digits as its factorization.

12509779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 12509779 is about 3536.9165950019. The cubic root of 12509779 is about 232.1399460351.

The spelling of 12509779 in words is "twelve million, five hundred nine thousand, seven hundred seventy-nine".