557201721 has 8 divisors (see below), whose sum is σ = 743055040. Its totient is φ = 371408112.

The previous prime is 557201717. The next prime is 557201747. The reversal of 557201721 is 127102755.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 557201721 - 2² = 557201717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (557201221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16011 + ... + 37023.

It is an arithmetic number, because the mean of its divisors is an integer number (92881880).

Almost surely, 2^557201721 is an apocalyptic number.

It is an amenable number.

557201721 is a deficient number, since it is larger than the sum of its proper divisors (185853319).

557201721 is a wasteful number, since it uses less digits than its factorization.

557201721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29855.

The product of its (nonzero) digits is 4900, while the sum is 30.

The square root of 557201721 is about 23605.1206520958. The cubic root of 557201721 is about 822.8818494092.

The spelling of 557201721 in words is "five hundred fifty-seven million, two hundred one thousand, seven hundred twenty-one".