641789429 has 4 divisors (see below), whose sum is σ = 675567840. Its totient is φ = 608011020.

The previous prime is 641789399. The next prime is 641789437. The reversal of 641789429 is 924987146.

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 641789429 - 2²⁰ = 640740853 is a prime.

It is a super-2 number, since 2×641789429² = 823787342352292082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641189429) 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, 16889177 + ... + 16889214.

It is an arithmetic number, because the mean of its divisors is an integer number (168891960).

Almost surely, 2^641789429 is an apocalyptic number.

It is an amenable number.

641789429 is a deficient number, since it is larger than the sum of its proper divisors (33778411).

641789429 is a wasteful number, since it uses less digits than its factorization.

641789429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33778410.

The product of its digits is 870912, while the sum is 50.

The square root of 641789429 is about 25333.5632906230. The cubic root of 641789429 is about 862.5762969403.

The spelling of 641789429 in words is "six hundred forty-one million, seven hundred eighty-nine thousand, four hundred twenty-nine".