57020581 has 4 divisors (see below), whose sum is σ = 57095500. Its totient is φ = 56945664.

The previous prime is 57020573. The next prime is 57020603. The reversal of 57020581 is 18502075.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28569025 + 28451556 = 5345^2 + 5334^2 .

It is a cyclic number.

It is not a de Polignac number, because 57020581 - 2³ = 57020573 is a prime.

It is a super-2 number, since 2×57020581² = 6502693315155122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57020531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36306 + ... + 37843.

It is an arithmetic number, because the mean of its divisors is an integer number (14273875).

Almost surely, 2^57020581 is an apocalyptic number.

It is an amenable number.

57020581 is a deficient number, since it is larger than the sum of its proper divisors (74919).

57020581 is an equidigital number, since it uses as much as digits as its factorization.

57020581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74918.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 57020581 is about 7551.1973222794. The cubic root of 57020581 is about 384.8964268532.

The spelling of 57020581 in words is "fifty-seven million, twenty thousand, five hundred eighty-one".