652632021 has 6 divisors (see below), whose sum is σ = 942690710. Its totient is φ = 435088008.

The previous prime is 652632017. The next prime is 652632047. The reversal of 652632021 is 120236256.

652632021 is a `hidden beast` number, since 6 + 5 + 2 + 632 + 0 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 538889796 + 113742225 = 23214^2 + 10665^2 .

It is not a de Polignac number, because 652632021 - 2² = 652632017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (652630021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36257326 + ... + 36257343.

Almost surely, 2^652632021 is an apocalyptic number.

It is an amenable number.

652632021 is a deficient number, since it is larger than the sum of its proper divisors (290058689).

652632021 is a wasteful number, since it uses less digits than its factorization.

652632021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72514675 (or 72514672 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 652632021 is about 25546.6635982079. The cubic root of 652632021 is about 867.4067407436.

Adding to 652632021 its reverse (120236256), we get a palindrome (772868277).

The spelling of 652632021 in words is "six hundred fifty-two million, six hundred thirty-two thousand, twenty-one".