51866249 has 2 divisors, whose sum is σ = 51866250. Its totient is φ = 51866248.

The previous prime is 51866237. The next prime is 51866261. The reversal of 51866249 is 94266815.

It is a happy number.

51866249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (51866237) and next prime (51866261).

It can be written as a sum of positive squares in only one way, i.e., 49000000 + 2866249 = 7000^2 + 1693^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51866249 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51866279) 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, 25933124 + 25933125.

It is an arithmetic number, because the mean of its divisors is an integer number (25933125).

Almost surely, 2^51866249 is an apocalyptic number.

It is an amenable number.

51866249 is a deficient number, since it is larger than the sum of its proper divisors (1).

51866249 is an equidigital number, since it uses as much as digits as its factorization.

51866249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The square root of 51866249 is about 7201.8226165326. The cubic root of 51866249 is about 372.9308235414.

The spelling of 51866249 in words is "fifty-one million, eight hundred sixty-six thousand, two hundred forty-nine".