57365821 has 2 divisors, whose sum is σ = 57365822. Its totient is φ = 57365820.

The previous prime is 57365801. The next prime is 57365849. The reversal of 57365821 is 12856375.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35640900 + 21724921 = 5970^2 + 4661^2 .

It is a cyclic number.

It is not a de Polignac number, because 57365821 - 2¹¹ = 57363773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57365801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28682910 + 28682911.

It is an arithmetic number, because the mean of its divisors is an integer number (28682911).

Almost surely, 2^57365821 is an apocalyptic number.

It is an amenable number.

57365821 is a deficient number, since it is larger than the sum of its proper divisors (1).

57365821 is an equidigital number, since it uses as much as digits as its factorization.

57365821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The square root of 57365821 is about 7574.0227752496. The cubic root of 57365821 is about 385.6716694898.

The spelling of 57365821 in words is "fifty-seven million, three hundred sixty-five thousand, eight hundred twenty-one".