641497574 has 32 divisors (see below), whose sum is σ = 1017861120. Its totient is φ = 302787072.

The previous prime is 641497573. The next prime is 641497583. The reversal of 641497574 is 475794146.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641497573) 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 15 ways as a sum of consecutive naturals, for example, 537122 + ... + 538314.

It is an arithmetic number, because the mean of its divisors is an integer number (31808160).

Almost surely, 2^641497574 is an apocalyptic number.

641497574 is a deficient number, since it is larger than the sum of its proper divisors (376363546).

641497574 is a wasteful number, since it uses less digits than its factorization.

641497574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424.

The product of its digits is 846720, while the sum is 47.

The square root of 641497574 is about 25327.8023918381. The cubic root of 641497574 is about 862.4455243617.

The spelling of 641497574 in words is "six hundred forty-one million, four hundred ninety-seven thousand, five hundred seventy-four".