641517673 has 4 divisors (see below), whose sum is σ = 642361428. Its totient is φ = 640673920.

The previous prime is 641517637. The next prime is 641517677. The reversal of 641517673 is 376715146.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35964009 + 605553664 = 5997^2 + 24608^2 .

It is a cyclic number.

It is not a de Polignac number, because 641517673 - 2²⁵ = 607963241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641517677) 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, 420736 + ... + 422257.

It is an arithmetic number, because the mean of its divisors is an integer number (160590357).

Almost surely, 2^641517673 is an apocalyptic number.

It is an amenable number.

641517673 is a deficient number, since it is larger than the sum of its proper divisors (843755).

641517673 is an equidigital number, since it uses as much as digits as its factorization.

641517673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843754.

The product of its digits is 105840, while the sum is 40.

The square root of 641517673 is about 25328.1991661468. The cubic root of 641517673 is about 862.4545314685.

It can be divided in two parts, 64151 and 7673, that added together give a square (71824 = 268²).

The spelling of 641517673 in words is "six hundred forty-one million, five hundred seventeen thousand, six hundred seventy-three".