57009581 has 2 divisors, whose sum is σ = 57009582. Its totient is φ = 57009580.

The previous prime is 57009553. The next prime is 57009583. The reversal of 57009581 is 18590075.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53787556 + 3222025 = 7334^2 + 1795^2 .

It is a cyclic number.

It is not a de Polignac number, because 57009581 - 2¹⁰ = 57008557 is a prime.

It is a super-2 number, since 2×57009581² = 6500184651591122, which contains 22 as substring.

Together with 57009583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57009583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28504790 + 28504791.

It is an arithmetic number, because the mean of its divisors is an integer number (28504791).

Almost surely, 2^57009581 is an apocalyptic number.

It is an amenable number.

57009581 is a deficient number, since it is larger than the sum of its proper divisors (1).

57009581 is an equidigital number, since it uses as much as digits as its factorization.

57009581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 35.

The square root of 57009581 is about 7550.4689258350. The cubic root of 57009581 is about 384.8716747789.

The spelling of 57009581 in words is "fifty-seven million, nine thousand, five hundred eighty-one".