641256541 has 4 divisors (see below), whose sum is σ = 678977532. Its totient is φ = 603535552.

The previous prime is 641256529. The next prime is 641256547. The reversal of 641256541 is 145652146.

641256541 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 214007641 + 427248900 = 14629^2 + 20670^2 .

It is a cyclic number.

It is not a de Polignac number, because 641256541 - 2¹⁷ = 641125469 is a prime.

It is a super-2 number, since 2×641256541² = 822419902750569362, 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 = 641256497 and 641256506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641256547) 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, 18860470 + ... + 18860503.

It is an arithmetic number, because the mean of its divisors is an integer number (169744383).

Almost surely, 2^641256541 is an apocalyptic number.

It is an amenable number.

641256541 is a deficient number, since it is larger than the sum of its proper divisors (37720991).

641256541 is a wasteful number, since it uses less digits than its factorization.

641256541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37720990.

The product of its digits is 28800, while the sum is 34.

The square root of 641256541 is about 25323.0436756722. The cubic root of 641256541 is about 862.3374938813.

The spelling of 641256541 in words is "six hundred forty-one million, two hundred fifty-six thousand, five hundred forty-one".