641535989 has 8 divisors (see below), whose sum is σ = 647162880. Its totient is φ = 635934096.

The previous prime is 641535977. The next prime is 641536003. The reversal of 641535989 is 989535146.

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 641535989 - 2²⁰ = 640487413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641535929) 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, 47279 + ... + 59315.

It is an arithmetic number, because the mean of its divisors is an integer number (80895360).

Almost surely, 2^641535989 is an apocalyptic number.

It is an amenable number.

641535989 is a deficient number, since it is larger than the sum of its proper divisors (5626891).

641535989 is a wasteful number, since it uses less digits than its factorization.

641535989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12499.

The product of its digits is 1166400, while the sum is 50.

The square root of 641535989 is about 25328.5607368441. The cubic root of 641535989 is about 862.4627393831.

The spelling of 641535989 in words is "six hundred forty-one million, five hundred thirty-five thousand, nine hundred eighty-nine".