51865279 has 2 divisors, whose sum is σ = 51865280. Its totient is φ = 51865278.

The previous prime is 51865273. The next prime is 51865301. The reversal of 51865279 is 97256815.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51865279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51865273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25932639 + 25932640.

It is an arithmetic number, because the mean of its divisors is an integer number (25932640).

Almost surely, 2^51865279 is an apocalyptic number.

51865279 is a deficient number, since it is larger than the sum of its proper divisors (1).

51865279 is an equidigital number, since it uses as much as digits as its factorization.

51865279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 43.

The square root of 51865279 is about 7201.7552721541. The cubic root of 51865279 is about 372.9284986824.

The spelling of 51865279 in words is "fifty-one million, eight hundred sixty-five thousand, two hundred seventy-nine".