57339781 has 2 divisors, whose sum is σ = 57339782. Its totient is φ = 57339780.

The previous prime is 57339773. The next prime is 57339787. The reversal of 57339781 is 18793375.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36409156 + 20930625 = 6034^2 + 4575^2 .

It is a cyclic number.

It is not a de Polignac number, because 57339781 - 2³ = 57339773 is a prime.

It is a super-3 number, since 3×57339781³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57339787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28669890 + 28669891.

It is an arithmetic number, because the mean of its divisors is an integer number (28669891).

Almost surely, 2^57339781 is an apocalyptic number.

It is an amenable number.

57339781 is a deficient number, since it is larger than the sum of its proper divisors (1).

57339781 is an equidigital number, since it uses as much as digits as its factorization.

57339781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 43.

The square root of 57339781 is about 7572.3035464778. The cubic root of 57339781 is about 385.6133048279.

The spelling of 57339781 in words is "fifty-seven million, three hundred thirty-nine thousand, seven hundred eighty-one".