557270721 has 12 divisors (see below), whose sum is σ = 919939072. Its totient is φ = 318440376.

The previous prime is 557270717. The next prime is 557270731. The reversal of 557270721 is 127072755.

It is not a de Polignac number, because 557270721 - 2² = 557270717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (557270731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4422721 + ... + 4422846.

Almost surely, 2^557270721 is an apocalyptic number.

It is an amenable number.

557270721 is a deficient number, since it is larger than the sum of its proper divisors (362668351).

557270721 is a wasteful number, since it uses less digits than its factorization.

557270721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8845580 (or 8845577 counting only the distinct ones).

The product of its (nonzero) digits is 34300, while the sum is 36.

The square root of 557270721 is about 23606.5821541366. The cubic root of 557270721 is about 822.9158146693.

The spelling of 557270721 in words is "five hundred fifty-seven million, two hundred seventy thousand, seven hundred twenty-one".