642540241 has 8 divisors (see below), whose sum is σ = 739010240. Its totient is φ = 547239888.

The previous prime is 642540209. The next prime is 642540263. The reversal of 642540241 is 142045246.

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 642540241 - 2⁵ = 642540209 is a prime.

It is a super-2 number, since 2×642540241² = 825715922608676162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642540341) 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, 291231 + ... + 293428.

It is an arithmetic number, because the mean of its divisors is an integer number (92376280).

Almost surely, 2^642540241 is an apocalyptic number.

It is an amenable number.

642540241 is a deficient number, since it is larger than the sum of its proper divisors (96469999).

642540241 is a wasteful number, since it uses less digits than its factorization.

642540241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584823.

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 642540241 is about 25348.3774825925. The cubic root of 642540241 is about 862.9125340403.

Adding to 642540241 its reverse (142045246), we get a palindrome (784585487).

The spelling of 642540241 in words is "six hundred forty-two million, five hundred forty thousand, two hundred forty-one".