641226441 has 4 divisors (see below), whose sum is σ = 854968592. Its totient is φ = 427484292.

The previous prime is 641226427. The next prime is 641226461. The reversal of 641226441 is 144622146.

It is a happy number.

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 641226441 - 2⁵ = 641226409 is a prime.

It is a super-2 number, since 2×641226441² = 822342697275052962, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 641226399 and 641226408.

It is not an unprimeable number, because it can be changed into a prime (641226401) 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, 106871071 + ... + 106871076.

It is an arithmetic number, because the mean of its divisors is an integer number (213742148).

Almost surely, 2^641226441 is an apocalyptic number.

It is an amenable number.

641226441 is a deficient number, since it is larger than the sum of its proper divisors (213742151).

641226441 is a wasteful number, since it uses less digits than its factorization.

641226441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213742150.

The product of its digits is 9216, while the sum is 30.

The square root of 641226441 is about 25322.4493483549. The cubic root of 641226441 is about 862.3240012238.

Adding to 641226441 its reverse (144622146), we get a palindrome (785848587).

The spelling of 641226441 in words is "six hundred forty-one million, two hundred twenty-six thousand, four hundred forty-one".