51287279 has 2 divisors, whose sum is σ = 51287280. Its totient is φ = 51287278.

The previous prime is 51287233. The next prime is 51287281. The reversal of 51287279 is 97278215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51287279 - 2²⁰ = 50238703 is a prime.

Together with 51287281, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51287209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25643639 + 25643640.

It is an arithmetic number, because the mean of its divisors is an integer number (25643640).

Almost surely, 2^51287279 is an apocalyptic number.

51287279 is a deficient number, since it is larger than the sum of its proper divisors (1).

51287279 is an equidigital number, since it uses as much as digits as its factorization.

51287279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 41.

The square root of 51287279 is about 7161.5137366342. The cubic root of 51287279 is about 371.5379833844.

The spelling of 51287279 in words is "fifty-one million, two hundred eighty-seven thousand, two hundred seventy-nine".