51581279 has 2 divisors, whose sum is σ = 51581280. Its totient is φ = 51581278.

The previous prime is 51581273. The next prime is 51581297. The reversal of 51581279 is 97218515.

51581279 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (51581297) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51581279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51581273) 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, 25790639 + 25790640.

It is an arithmetic number, because the mean of its divisors is an integer number (25790640).

Almost surely, 2^51581279 is an apocalyptic number.

51581279 is a deficient number, since it is larger than the sum of its proper divisors (1).

51581279 is an equidigital number, since it uses as much as digits as its factorization.

51581279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 38.

The square root of 51581279 is about 7182.0107908579. The cubic root of 51581279 is about 372.2465678523.

The spelling of 51581279 in words is "fifty-one million, five hundred eighty-one thousand, two hundred seventy-nine".