12555779 has 2 divisors, whose sum is σ = 12555780. Its totient is φ = 12555778.

The previous prime is 12555757. The next prime is 12555791. The reversal of 12555779 is 97755521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12555779 - 2¹⁶ = 12490243 is a prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (12555709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6277889 + 6277890.

It is an arithmetic number, because the mean of its divisors is an integer number (6277890).

Almost surely, 2^12555779 is an apocalyptic number.

12555779 is a deficient number, since it is larger than the sum of its proper divisors (1).

12555779 is an equidigital number, since it uses as much as digits as its factorization.

12555779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110250, while the sum is 41.

The square root of 12555779 is about 3543.4134672657. The cubic root of 12555779 is about 232.4241337239.

The spelling of 12555779 in words is "twelve million, five hundred fifty-five thousand, seven hundred seventy-nine".