57027781 has 2 divisors, whose sum is σ = 57027782. Its totient is φ = 57027780.

The previous prime is 57027749. The next prime is 57027799. The reversal of 57027781 is 18772075.

57027781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57002500 + 25281 = 7550^2 + 159^2 .

It is a cyclic number.

It is not a de Polignac number, because 57027781 - 2⁵ = 57027749 is a prime.

It is a super-2 number, since 2×57027781² = 6504335611567922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57027781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57027881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28513890 + 28513891.

It is an arithmetic number, because the mean of its divisors is an integer number (28513891).

Almost surely, 2^57027781 is an apocalyptic number.

It is an amenable number.

57027781 is a deficient number, since it is larger than the sum of its proper divisors (1).

57027781 is an equidigital number, since it uses as much as digits as its factorization.

57027781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 57027781 is about 7551.6740528177. The cubic root of 57027781 is about 384.9126264873.

The spelling of 57027781 in words is "fifty-seven million, twenty-seven thousand, seven hundred eighty-one".