51787273 has 2 divisors, whose sum is σ = 51787274. Its totient is φ = 51787272.

The previous prime is 51787271. The next prime is 51787277. The reversal of 51787273 is 37278715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43072969 + 8714304 = 6563^2 + 2952^2 .

It is a cyclic number.

It is not a de Polignac number, because 51787273 - 2¹ = 51787271 is a prime.

Together with 51787271, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51787271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25893636 + 25893637.

It is an arithmetic number, because the mean of its divisors is an integer number (25893637).

Almost surely, 2^51787273 is an apocalyptic number.

It is an amenable number.

51787273 is a deficient number, since it is larger than the sum of its proper divisors (1).

51787273 is an equidigital number, since it uses as much as digits as its factorization.

51787273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82320, while the sum is 40.

The square root of 51787273 is about 7196.3374712419. The cubic root of 51787273 is about 372.7414418982.

The spelling of 51787273 in words is "fifty-one million, seven hundred eighty-seven thousand, two hundred seventy-three".