572116721 has 4 divisors (see below), whose sum is σ = 624127344. Its totient is φ = 520106100.

The previous prime is 572116717. The next prime is 572116739. The reversal of 572116721 is 127611275.

572116721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 572116721 - 2² = 572116717 is a prime.

It is a super-3 number, since 3×572116721³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (572116711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26005295 + ... + 26005316.

It is an arithmetic number, because the mean of its divisors is an integer number (156031836).

Almost surely, 2^572116721 is an apocalyptic number.

It is an amenable number.

572116721 is a deficient number, since it is larger than the sum of its proper divisors (52010623).

572116721 is a wasteful number, since it uses less digits than its factorization.

572116721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52010622.

The product of its digits is 5880, while the sum is 32.

The square root of 572116721 is about 23918.9615368226. The cubic root of 572116721 is about 830.1595091897.

Adding to 572116721 its reverse (127611275), we get a palindrome (699727996).

The spelling of 572116721 in words is "five hundred seventy-two million, one hundred sixteen thousand, seven hundred twenty-one".