5657321 has 2 divisors, whose sum is σ = 5657322. Its totient is φ = 5657320.

The previous prime is 5657317. The next prime is 5657329. The reversal of 5657321 is 1237565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4243600 + 1413721 = 2060^2 + 1189^2 .

It is a cyclic number.

It is not a de Polignac number, because 5657321 - 2² = 5657317 is a prime.

It is equal to p₃₉₀₈₄₅ and since 5657321 and 390845 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (5657329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2828660 + 2828661.

It is an arithmetic number, because the mean of its divisors is an integer number (2828661).

Almost surely, 2^5657321 is an apocalyptic number.

It is an amenable number.

5657321 is a deficient number, since it is larger than the sum of its proper divisors (1).

5657321 is an equidigital number, since it uses as much as digits as its factorization.

5657321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6300, while the sum is 29.

The square root of 5657321 is about 2378.5123501887. The cubic root of 5657321 is about 178.1846440665.

The spelling of 5657321 in words is "five million, six hundred fifty-seven thousand, three hundred twenty-one".