643037601 has 4 divisors (see below), whose sum is σ = 857383472. Its totient is φ = 428691732.

The previous prime is 643037581. The next prime is 643037623. The reversal of 643037601 is 106730346.

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 not a de Polignac number, because 643037601 - 2¹⁷ = 642906529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643037641) 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, 107172931 + ... + 107172936.

It is an arithmetic number, because the mean of its divisors is an integer number (214345868).

Almost surely, 2^643037601 is an apocalyptic number.

It is an amenable number.

643037601 is a deficient number, since it is larger than the sum of its proper divisors (214345871).

643037601 is a wasteful number, since it uses less digits than its factorization.

643037601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214345870.

The product of its (nonzero) digits is 9072, while the sum is 30.

The square root of 643037601 is about 25358.1860747176. The cubic root of 643037601 is about 863.1351232068.

Adding to 643037601 its reverse (106730346), we get a palindrome (749767947).

The spelling of 643037601 in words is "six hundred forty-three million, thirty-seven thousand, six hundred one".