643446041 has 4 divisors (see below), whose sum is σ = 735366912. Its totient is φ = 551525172.

The previous prime is 643446031. The next prime is 643446103. The reversal of 643446041 is 140644346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 643446041 - 2²² = 639251737 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 643445989 and 643446007.

It is not an unprimeable number, because it can be changed into a prime (643446031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45960425 + ... + 45960438.

It is an arithmetic number, because the mean of its divisors is an integer number (183841728).

Almost surely, 2^643446041 is an apocalyptic number.

It is an amenable number.

643446041 is a deficient number, since it is larger than the sum of its proper divisors (91920871).

643446041 is an equidigital number, since it uses as much as digits as its factorization.

643446041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91920870.

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 643446041 is about 25366.2382114495. The cubic root of 643446041 is about 863.3178311824.

The spelling of 643446041 in words is "six hundred forty-three million, four hundred forty-six thousand, forty-one".