641965049 has 8 divisors (see below), whose sum is σ = 700871520. Its totient is φ = 583149600.

The previous prime is 641965039. The next prime is 641965069. The reversal of 641965049 is 940569146.

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

It is not a de Polignac number, because 641965049 - 2¹⁶ = 641899513 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (641965039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7559 + ... + 36620.

It is an arithmetic number, because the mean of its divisors is an integer number (87608940).

Almost surely, 2^641965049 is an apocalyptic number.

It is an amenable number.

641965049 is a deficient number, since it is larger than the sum of its proper divisors (58906471).

641965049 is a wasteful number, since it uses less digits than its factorization.

641965049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45511.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 641965049 is about 25337.0292062823. The cubic root of 641965049 is about 862.6549685559.

The spelling of 641965049 in words is "six hundred forty-one million, nine hundred sixty-five thousand, forty-nine".