641021711 has 4 divisors (see below), whose sum is σ = 699296424. Its totient is φ = 582747000.

The previous prime is 641021701. The next prime is 641021723. The reversal of 641021711 is 117120146.

It is a happy number.

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

It is not a de Polignac number, because 641021711 - 2²⁶ = 573912847 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 (641021701) 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, 29137340 + ... + 29137361.

It is an arithmetic number, because the mean of its divisors is an integer number (174824106).

Almost surely, 2^641021711 is an apocalyptic number.

641021711 is a deficient number, since it is larger than the sum of its proper divisors (58274713).

641021711 is a wasteful number, since it uses less digits than its factorization.

641021711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58274712.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 641021711 is about 25318.4065651849. The cubic root of 641021711 is about 862.2322175347.

Adding to 641021711 its reverse (117120146), we get a palindrome (758141857).

The spelling of 641021711 in words is "six hundred forty-one million, twenty-one thousand, seven hundred eleven".