57281249 has 2 divisors, whose sum is σ = 57281250. Its totient is φ = 57281248.

The previous prime is 57281243. The next prime is 57281261. The reversal of 57281249 is 94218275.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56896849 + 384400 = 7543^2 + 620^2 .

It is a cyclic number.

It is not a de Polignac number, because 57281249 - 2⁴ = 57281233 is a prime.

It is a super-2 number, since 2×57281249² = 6562282974000002, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (57281243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28640624 + 28640625.

It is an arithmetic number, because the mean of its divisors is an integer number (28640625).

Almost surely, 2^57281249 is an apocalyptic number.

It is an amenable number.

57281249 is a deficient number, since it is larger than the sum of its proper divisors (1).

57281249 is an equidigital number, since it uses as much as digits as its factorization.

57281249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 38.

The square root of 57281249 is about 7568.4376855465. The cubic root of 57281249 is about 385.4820498078.

The spelling of 57281249 in words is "fifty-seven million, two hundred eighty-one thousand, two hundred forty-nine".