641494549 has 4 divisors (see below), whose sum is σ = 675257440. Its totient is φ = 607731660.

The previous prime is 641494543. The next prime is 641494561. The reversal of 641494549 is 945494146.

641494549 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, 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 641494549 - 2⁵ = 641494517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 641494499 and 641494508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641494543) 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, 16881417 + ... + 16881454.

It is an arithmetic number, because the mean of its divisors is an integer number (168814360).

Almost surely, 2^641494549 is an apocalyptic number.

It is an amenable number.

641494549 is a deficient number, since it is larger than the sum of its proper divisors (33762891).

641494549 is a wasteful number, since it uses less digits than its factorization.

641494549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33762890.

The product of its digits is 622080, while the sum is 46.

The square root of 641494549 is about 25327.7426747825. The cubic root of 641494549 is about 862.4441687308. Note that the first 3 decimals are identical.

The spelling of 641494549 in words is "six hundred forty-one million, four hundred ninety-four thousand, five hundred forty-nine".