5721557 has 2 divisors, whose sum is σ = 5721558. Its totient is φ = 5721556.

The previous prime is 5721539. The next prime is 5721563. The reversal of 5721557 is 7551275.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5692996 + 28561 = 2386^2 + 169^2 .

It is a cyclic number.

It is not a de Polignac number, because 5721557 - 2⁶ = 5721493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5721517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2860778 + 2860779.

It is an arithmetic number, because the mean of its divisors is an integer number (2860779).

Almost surely, 2^5721557 is an apocalyptic number.

It is an amenable number.

5721557 is a deficient number, since it is larger than the sum of its proper divisors (1).

5721557 is an equidigital number, since it uses as much as digits as its factorization.

5721557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12250, while the sum is 32.

The square root of 5721557 is about 2391.9776336747. The cubic root of 5721557 is about 178.8565062043.

The spelling of 5721557 in words is "five million, seven hundred twenty-one thousand, five hundred fifty-seven".