652213721 has 8 divisors (see below), whose sum is σ = 693449064. Its totient is φ = 611297280.

The previous prime is 652213717. The next prime is 652213733. The reversal of 652213721 is 127312256.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 355134025 + 297079696 = 18845^2 + 17236^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 652213721 - 2² = 652213717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (652213321) 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, 75500 + ... + 83693.

It is an arithmetic number, because the mean of its divisors is an integer number (86681133).

Almost surely, 2^652213721 is an apocalyptic number.

It is an amenable number.

652213721 is a deficient number, since it is larger than the sum of its proper divisors (41235343).

652213721 is a wasteful number, since it uses less digits than its factorization.

652213721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159451.

The product of its digits is 5040, while the sum is 29.

The square root of 652213721 is about 25538.4753068777. The cubic root of 652213721 is about 867.2213816771.

Adding to 652213721 its reverse (127312256), we get a palindrome (779525977).

The spelling of 652213721 in words is "six hundred fifty-two million, two hundred thirteen thousand, seven hundred twenty-one".