12555511 has 2 divisors, whose sum is σ = 12555512. Its totient is φ = 12555510.

The previous prime is 12555509. The next prime is 12555547. The reversal of 12555511 is 11555521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12555511 - 2¹ = 12555509 is a prime.

It is a super-2 number, since 2×12555511² = 315281712942242, which contains 22 as substring.

Together with 12555509, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12555551) 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, 6277755 + 6277756.

It is an arithmetic number, because the mean of its divisors is an integer number (6277756).

Almost surely, 2^12555511 is an apocalyptic number.

12555511 is a deficient number, since it is larger than the sum of its proper divisors (1).

12555511 is an equidigital number, since it uses as much as digits as its factorization.

12555511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1250, while the sum is 25.

The square root of 12555511 is about 3543.3756504215. The cubic root of 12555511 is about 232.4224800336.

The spelling of 12555511 in words is "twelve million, five hundred fifty-five thousand, five hundred eleven".