642522201 has 8 divisors (see below), whose sum is σ = 858732864. Its totient is φ = 427329840.

The previous prime is 642522187. The next prime is 642522217. The reversal of 642522201 is 102225246.

It is a happy number.

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

It is not a de Polignac number, because 642522201 - 2⁷ = 642522073 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (642522241) 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 7 ways as a sum of consecutive naturals, for example, 253101 + ... + 255626.

It is an arithmetic number, because the mean of its divisors is an integer number (107341608).

Almost surely, 2^642522201 is an apocalyptic number.

It is an amenable number.

642522201 is a deficient number, since it is larger than the sum of its proper divisors (216210663).

642522201 is a wasteful number, since it uses less digits than its factorization.

642522201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509151.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 642522201 is about 25348.0216387788. The cubic root of 642522201 is about 862.9044582360.

Adding to 642522201 its reverse (102225246), we get a palindrome (744747447).

The spelling of 642522201 in words is "six hundred forty-two million, five hundred twenty-two thousand, two hundred one".