57784981 has 2 divisors, whose sum is σ = 57784982. Its totient is φ = 57784980.

The previous prime is 57784963. The next prime is 57784997. The reversal of 57784981 is 18948775.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45778756 + 12006225 = 6766^2 + 3465^2 .

It is a cyclic number.

It is not a de Polignac number, because 57784981 - 2¹⁷ = 57653909 is a prime.

It is a super-2 number, since 2×57784981² = 6678208058340722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57784381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28892490 + 28892491.

It is an arithmetic number, because the mean of its divisors is an integer number (28892491).

Almost surely, 2^57784981 is an apocalyptic number.

It is an amenable number.

57784981 is a deficient number, since it is larger than the sum of its proper divisors (1).

57784981 is an equidigital number, since it uses as much as digits as its factorization.

57784981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 564480, while the sum is 49.

The square root of 57784981 is about 7601.6433091799. The cubic root of 57784981 is about 386.6087314936.

It can be divided in two parts, 577 and 84981, that added together give a palindrome (85558).

The spelling of 57784981 in words is "fifty-seven million, seven hundred eighty-four thousand, nine hundred eighty-one".