12551569 has 2 divisors, whose sum is σ = 12551570. Its totient is φ = 12551568.

The previous prime is 12551557. The next prime is 12551587. The reversal of 12551569 is 96515521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10647169 + 1904400 = 3263^2 + 1380^2 .

It is a cyclic number.

It is not a de Polignac number, because 12551569 - 2¹¹ = 12549521 is a prime.

It is a super-2 number, since 2×12551569² = 315083768723522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12551549) 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, 6275784 + 6275785.

It is an arithmetic number, because the mean of its divisors is an integer number (6275785).

Almost surely, 2^12551569 is an apocalyptic number.

It is an amenable number.

12551569 is a deficient number, since it is larger than the sum of its proper divisors (1).

12551569 is an equidigital number, since it uses as much as digits as its factorization.

12551569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13500, while the sum is 34.

The square root of 12551569 is about 3542.8193575174. The cubic root of 12551569 is about 232.3981532574.

The spelling of 12551569 in words is "twelve million, five hundred fifty-one thousand, five hundred sixty-nine".