641530541 has 8 divisors (see below), whose sum is σ = 653049600. Its totient is φ = 630033120.

The previous prime is 641530517. The next prime is 641530543. The reversal of 641530541 is 145035146.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 641530541 - 2²⁶ = 574421677 is a prime.

It is a super-2 number, since 2×641530541² = 823122870071505362, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641530543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61796 + ... + 71426.

It is an arithmetic number, because the mean of its divisors is an integer number (81631200).

Almost surely, 2^641530541 is an apocalyptic number.

It is an amenable number.

641530541 is a deficient number, since it is larger than the sum of its proper divisors (11519059).

641530541 is a wasteful number, since it uses less digits than its factorization.

641530541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10819.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 641530541 is about 25328.4531900391. The cubic root of 641530541 is about 862.4602979975.

Adding to 641530541 its reverse (145035146), we get a palindrome (786565687).

The spelling of 641530541 in words is "six hundred forty-one million, five hundred thirty thousand, five hundred forty-one".