57065621 has 2 divisors, whose sum is σ = 57065622. Its totient is φ = 57065620.

The previous prime is 57065597. The next prime is 57065623. The reversal of 57065621 is 12656075.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32364721 + 24700900 = 5689^2 + 4970^2 .

It is a cyclic number.

It is not a de Polignac number, because 57065621 - 2⁶ = 57065557 is a prime.

Together with 57065623, 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 (57065623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28532810 + 28532811.

It is an arithmetic number, because the mean of its divisors is an integer number (28532811).

Almost surely, 2^57065621 is an apocalyptic number.

It is an amenable number.

57065621 is a deficient number, since it is larger than the sum of its proper divisors (1).

57065621 is an equidigital number, since it uses as much as digits as its factorization.

57065621 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 32.

The square root of 57065621 is about 7554.1790420932. The cubic root of 57065621 is about 384.9977421580.

The spelling of 57065621 in words is "fifty-seven million, sixty-five thousand, six hundred twenty-one".