641247441 has 4 divisors (see below), whose sum is σ = 854996592. Its totient is φ = 427498292.

The previous prime is 641247437. The next prime is 641247443. The reversal of 641247441 is 144742146.

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 641247441 - 2² = 641247437 is a prime.

It is a super-2 number, since 2×641247441² = 822396561178096962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641247443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106874571 + ... + 106874576.

It is an arithmetic number, because the mean of its divisors is an integer number (213749148).

Almost surely, 2^641247441 is an apocalyptic number.

It is an amenable number.

641247441 is a deficient number, since it is larger than the sum of its proper divisors (213749151).

641247441 is a wasteful number, since it uses less digits than its factorization.

641247441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213749150.

The product of its digits is 21504, while the sum is 33.

The square root of 641247441 is about 25322.8639967915. The cubic root of 641247441 is about 862.3334147503. Note that the first 3 decimals are identical.

Adding to 641247441 its reverse (144742146), we get a palindrome (785989587).

The spelling of 641247441 in words is "six hundred forty-one million, two hundred forty-seven thousand, four hundred forty-one".