51206569 has 2 divisors, whose sum is σ = 51206570. Its totient is φ = 51206568.

The previous prime is 51206563. The next prime is 51206587. The reversal of 51206569 is 96560215.

It is a happy number.

51206569 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51194025 + 12544 = 7155^2 + 112^2 .

It is a cyclic number.

It is not a de Polignac number, because 51206569 - 2¹³ = 51198377 is a prime.

It is a super-2 number, since 2×51206569² = 5244225417503522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51206563) 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, 25603284 + 25603285.

It is an arithmetic number, because the mean of its divisors is an integer number (25603285).

Almost surely, 2^51206569 is an apocalyptic number.

It is an amenable number.

51206569 is a deficient number, since it is larger than the sum of its proper divisors (1).

51206569 is an equidigital number, since it uses as much as digits as its factorization.

51206569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 51206569 is about 7155.8765361065. The cubic root of 51206569 is about 371.3429865292.

The spelling of 51206569 in words is "fifty-one million, two hundred six thousand, five hundred sixty-nine".