57223781 has 2 divisors, whose sum is σ = 57223782. Its totient is φ = 57223780.

The previous prime is 57223753. The next prime is 57223847. The reversal of 57223781 is 18732275.

57223781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52562500 + 4661281 = 7250^2 + 2159^2 .

It is a cyclic number.

It is not a de Polignac number, because 57223781 - 2¹⁸ = 56961637 is a prime.

It is a super-2 number, since 2×57223781² = 6549122223871922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57225781) 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, 28611890 + 28611891.

It is an arithmetic number, because the mean of its divisors is an integer number (28611891).

Almost surely, 2^57223781 is an apocalyptic number.

It is an amenable number.

57223781 is a deficient number, since it is larger than the sum of its proper divisors (1).

57223781 is an equidigital number, since it uses as much as digits as its factorization.

57223781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23520, while the sum is 35.

The square root of 57223781 is about 7564.6401765054. The cubic root of 57223781 is about 385.3530937339.

The spelling of 57223781 in words is "fifty-seven million, two hundred twenty-three thousand, seven hundred eighty-one".