641605983 has 8 divisors (see below), whose sum is σ = 857058096. Its totient is φ = 426945600.

The previous prime is 641605981. The next prime is 641606033. The reversal of 641605983 is 389506146.

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

It is not a de Polignac number, because 641605983 - 2¹ = 641605981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641605981) 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, 196038 + ... + 199283.

It is an arithmetic number, because the mean of its divisors is an integer number (107132262).

Almost surely, 2^641605983 is an apocalyptic number.

641605983 is a deficient number, since it is larger than the sum of its proper divisors (215452113).

641605983 is a wasteful number, since it uses less digits than its factorization.

641605983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395865.

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 641605983 is about 25329.9424199898. The cubic root of 641605983 is about 862.4941042235.

The spelling of 641605983 in words is "six hundred forty-one million, six hundred five thousand, nine hundred eighty-three".