12555121 has 2 divisors, whose sum is σ = 12555122. Its totient is φ = 12555120.

The previous prime is 12555119. The next prime is 12555149. The reversal of 12555121 is 12155521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6305121 + 6250000 = 2511^2 + 2500^2 .

It is a cyclic number.

It is not a de Polignac number, because 12555121 - 2¹ = 12555119 is a prime.

Together with 12555119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 12555092 and 12555101.

It is not a weakly prime, because it can be changed into another prime (12552121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6277560 + 6277561.

It is an arithmetic number, because the mean of its divisors is an integer number (6277561).

Almost surely, 2^12555121 is an apocalyptic number.

It is an amenable number.

12555121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12555121 is an equidigital number, since it uses as much as digits as its factorization.

12555121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 500, while the sum is 22.

The square root of 12555121 is about 3543.3206177257. The cubic root of 12555121 is about 232.4200735019.

The spelling of 12555121 in words is "twelve million, five hundred fifty-five thousand, one hundred twenty-one".