57281773 has 2 divisors, whose sum is σ = 57281774. Its totient is φ = 57281772.

The previous prime is 57281737. The next prime is 57281779. The reversal of 57281773 is 37718275.

Together with previous prime (57281737) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51796809 + 5484964 = 7197^2 + 2342^2 .

It is a cyclic number.

It is not a de Polignac number, because 57281773 - 2⁹ = 57281261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57281779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28640886 + 28640887.

It is an arithmetic number, because the mean of its divisors is an integer number (28640887).

Almost surely, 2^57281773 is an apocalyptic number.

It is an amenable number.

57281773 is a deficient number, since it is larger than the sum of its proper divisors (1).

57281773 is an equidigital number, since it uses as much as digits as its factorization.

57281773 is an evil number, because the sum of its binary digits is even.

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

The square root of 57281773 is about 7568.4723029156. The cubic root of 57281773 is about 385.4832252476.

The spelling of 57281773 in words is "fifty-seven million, two hundred eighty-one thousand, seven hundred seventy-three".