641544869 has 16 divisors (see below), whose sum is σ = 747987840. Its totient is φ = 538868160.

The previous prime is 641544863. The next prime is 641544901. The reversal of 641544869 is 968445146.

It is a happy number.

641544869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 641544869 - 2⁸ = 641544613 is a prime.

It is a super-2 number, since 2×641544869² = 823159637880454322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641544863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118187 + ... + 123495.

It is an arithmetic number, because the mean of its divisors is an integer number (46749240).

Almost surely, 2^641544869 is an apocalyptic number.

It is an amenable number.

641544869 is a deficient number, since it is larger than the sum of its proper divisors (106442971).

641544869 is a wasteful number, since it uses less digits than its factorization.

641544869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5660.

The product of its digits is 829440, while the sum is 47.

The square root of 641544869 is about 25328.7360324198. The cubic root of 641544869 is about 862.4667187046.

The spelling of 641544869 in words is "six hundred forty-one million, five hundred forty-four thousand, eight hundred sixty-nine".