641895617 has 4 divisors (see below), whose sum is σ = 700249776. Its totient is φ = 583541460.

The previous prime is 641895607. The next prime is 641895623. The reversal of 641895617 is 716598146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 641895617 - 2¹⁴ = 641879233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641895607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29177063 + ... + 29177084.

It is an arithmetic number, because the mean of its divisors is an integer number (175062444).

Almost surely, 2^641895617 is an apocalyptic number.

It is an amenable number.

641895617 is a deficient number, since it is larger than the sum of its proper divisors (58354159).

641895617 is a wasteful number, since it uses less digits than its factorization.

641895617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58354158.

The product of its digits is 362880, while the sum is 47.

The square root of 641895617 is about 25335.6590007049. The cubic root of 641895617 is about 862.6238671642.

The spelling of 641895617 in words is "six hundred forty-one million, eight hundred ninety-five thousand, six hundred seventeen".