643026241 has 24 divisors (see below), whose sum is σ = 804315744. Its totient is φ = 507836160.

The previous prime is 643026239. The next prime is 643026259. The reversal of 643026241 is 142620346.

It is not a de Polignac number, because 643026241 - 2¹ = 643026239 is a prime.

It is a super-2 number, since 2×643026241² = 826965493229180162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643026221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21430 + ... + 41776.

It is an arithmetic number, because the mean of its divisors is an integer number (33513156).

Almost surely, 2^643026241 is an apocalyptic number.

It is an amenable number.

643026241 is a deficient number, since it is larger than the sum of its proper divisors (161289503).

643026241 is a wasteful number, since it uses less digits than its factorization.

643026241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20401 (or 20388 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 643026241 is about 25357.9620829435. The cubic root of 643026241 is about 863.1300404181.

Adding to 643026241 its reverse (142620346), we get a palindrome (785646587).

The spelling of 643026241 in words is "six hundred forty-three million, twenty-six thousand, two hundred forty-one".