641982533 has 4 divisors (see below), whose sum is σ = 642912288. Its totient is φ = 641052780.

The previous prime is 641982521. The next prime is 641982547. The reversal of 641982533 is 335289146.

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 641982533 - 2⁸ = 641982277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641982433) 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, 463841 + ... + 465222.

It is an arithmetic number, because the mean of its divisors is an integer number (160728072).

Almost surely, 2^641982533 is an apocalyptic number.

It is an amenable number.

641982533 is a deficient number, since it is larger than the sum of its proper divisors (929755).

641982533 is an equidigital number, since it uses as much as digits as its factorization.

641982533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929754.

The product of its digits is 155520, while the sum is 41.

The square root of 641982533 is about 25337.3742325443. The cubic root of 641982533 is about 862.6627999908.

The spelling of 641982533 in words is "six hundred forty-one million, nine hundred eighty-two thousand, five hundred thirty-three".