641533839 has 4 divisors (see below), whose sum is σ = 855378456. Its totient is φ = 427689224.

The previous prime is 641533819. The next prime is 641533843. The reversal of 641533839 is 938335146.

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 641533839 - 2⁸ = 641533583 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 641533839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641533819) 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, 106922304 + ... + 106922309.

It is an arithmetic number, because the mean of its divisors is an integer number (213844614).

Almost surely, 2^641533839 is an apocalyptic number.

641533839 is a deficient number, since it is larger than the sum of its proper divisors (213844617).

641533839 is a wasteful number, since it uses less digits than its factorization.

641533839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213844616.

The product of its digits is 233280, while the sum is 42.

The square root of 641533839 is about 25328.5182946022. The cubic root of 641533839 is about 862.4617759158.

The spelling of 641533839 in words is "six hundred forty-one million, five hundred thirty-three thousand, eight hundred thirty-nine".