641344541 has 4 divisors (see below), whose sum is σ = 663459900. Its totient is φ = 619229184.

The previous prime is 641344537. The next prime is 641344547. The reversal of 641344541 is 145443146.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 145443146 = 2 ⋅72721573.

It can be written as a sum of positive squares in 2 ways, for example, as 429525625 + 211818916 = 20725^2 + 14554^2 .

It is a cyclic number.

It is not a de Polignac number, because 641344541 - 2² = 641344537 is a prime.

It is a super-2 number, since 2×641344541² = 822645640541001362, 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 = 641344498 and 641344507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641344547) 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, 11057636 + ... + 11057693.

It is an arithmetic number, because the mean of its divisors is an integer number (165864975).

Almost surely, 2^641344541 is an apocalyptic number.

It is an amenable number.

641344541 is a deficient number, since it is larger than the sum of its proper divisors (22115359).

641344541 is a wasteful number, since it uses less digits than its factorization.

641344541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22115358.

The product of its digits is 23040, while the sum is 32.

The square root of 641344541 is about 25324.7811639114. The cubic root of 641344541 is about 862.3769384320.

Adding to 641344541 its reverse (145443146), we get a palindrome (786787687).

The spelling of 641344541 in words is "six hundred forty-one million, three hundred forty-four thousand, five hundred forty-one".