57047281 has 2 divisors, whose sum is σ = 57047282. Its totient is φ = 57047280.

The previous prime is 57047279. The next prime is 57047297. The reversal of 57047281 is 18274075.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54538225 + 2509056 = 7385^2 + 1584^2 .

It is a cyclic number.

It is not a de Polignac number, because 57047281 - 2¹ = 57047279 is a prime.

It is a super-2 number, since 2×57047281² = 6508784538985922, which contains 22 as substring.

Together with 57047279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (57047201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28523640 + 28523641.

It is an arithmetic number, because the mean of its divisors is an integer number (28523641).

Almost surely, 2^57047281 is an apocalyptic number.

It is an amenable number.

57047281 is a deficient number, since it is larger than the sum of its proper divisors (1).

57047281 is an equidigital number, since it uses as much as digits as its factorization.

57047281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 57047281 is about 7552.9650469203. The cubic root of 57047281 is about 384.9564936502.

The spelling of 57047281 in words is "fifty-seven million, forty-seven thousand, two hundred eighty-one".