51957281 has 2 divisors, whose sum is σ = 51957282. Its totient is φ = 51957280.

The previous prime is 51957277. The next prime is 51957289. The reversal of 51957281 is 18275915.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27206656 + 24750625 = 5216^2 + 4975^2 .

It is a cyclic number.

It is not a de Polignac number, because 51957281 - 2² = 51957277 is a prime.

It is a super-2 number, since 2×51957281² = 5399118097825922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51957289) 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, 25978640 + 25978641.

It is an arithmetic number, because the mean of its divisors is an integer number (25978641).

Almost surely, 2^51957281 is an apocalyptic number.

It is an amenable number.

51957281 is a deficient number, since it is larger than the sum of its proper divisors (1).

51957281 is an equidigital number, since it uses as much as digits as its factorization.

51957281 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 51957281 is about 7208.1399126266. The cubic root of 51957281 is about 373.1488766897.

The spelling of 51957281 in words is "fifty-one million, nine hundred fifty-seven thousand, two hundred eighty-one".