557358721 has 2 divisors, whose sum is σ = 557358722. Its totient is φ = 557358720.

The previous prime is 557358709. The next prime is 557358731. The reversal of 557358721 is 127853755.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 497513025 + 59845696 = 22305^2 + 7736^2 .

It is a cyclic number.

It is not a de Polignac number, because 557358721 - 2¹⁹ = 556834433 is a prime.

It is not a weakly prime, because it can be changed into another prime (557358731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278679360 + 278679361.

It is an arithmetic number, because the mean of its divisors is an integer number (278679361).

Almost surely, 2^557358721 is an apocalyptic number.

It is an amenable number.

557358721 is a deficient number, since it is larger than the sum of its proper divisors (1).

557358721 is an equidigital number, since it uses as much as digits as its factorization.

557358721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 294000, while the sum is 43.

The square root of 557358721 is about 23608.4459674922. The cubic root of 557358721 is about 822.9591286143.

The spelling of 557358721 in words is "five hundred fifty-seven million, three hundred fifty-eight thousand, seven hundred twenty-one".