12509911 has 2 divisors, whose sum is σ = 12509912. Its totient is φ = 12509910.

The previous prime is 12509869. The next prime is 12509921. The reversal of 12509911 is 11990521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12509911 - 2¹¹ = 12507863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12509911.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12509921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6254955 + 6254956.

It is an arithmetic number, because the mean of its divisors is an integer number (6254956).

Almost surely, 2^12509911 is an apocalyptic number.

12509911 is a deficient number, since it is larger than the sum of its proper divisors (1).

12509911 is an equidigital number, since it uses as much as digits as its factorization.

12509911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 28.

The square root of 12509911 is about 3536.9352552740. The cubic root of 12509911 is about 232.1407625260.

The spelling of 12509911 in words is "twelve million, five hundred nine thousand, nine hundred eleven".