641433211 has 4 divisors (see below), whose sum is σ = 642772800. Its totient is φ = 640093624.

The previous prime is 641433173. The next prime is 641433227. The reversal of 641433211 is 112334146.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 641433211 - 2¹⁵ = 641400443 is a prime.

It is a super-2 number, since 2×641433211² = 822873128347541042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641433251) 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, 669076 + ... + 670033.

It is an arithmetic number, because the mean of its divisors is an integer number (160693200).

Almost surely, 2^641433211 is an apocalyptic number.

641433211 is a deficient number, since it is larger than the sum of its proper divisors (1339589).

641433211 is a wasteful number, since it uses less digits than its factorization.

641433211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339588.

The product of its digits is 1728, while the sum is 25.

The square root of 641433211 is about 25326.5317601917. The cubic root of 641433211 is about 862.4166796499.

Adding to 641433211 its reverse (112334146), we get a palindrome (753767357).

The spelling of 641433211 in words is "six hundred forty-one million, four hundred thirty-three thousand, two hundred eleven".