641205791 has 8 divisors (see below), whose sum is σ = 651190080. Its totient is φ = 631268352.

The previous prime is 641205781. The next prime is 641205811. The reversal of 641205791 is 197502146.

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 641205791 - 2²⁶ = 574096927 is a prime.

It is a super-2 number, since 2×641205791² = 822289732823871362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641205781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16391 + ... + 39383.

It is an arithmetic number, because the mean of its divisors is an integer number (81398760).

Almost surely, 2^641205791 is an apocalyptic number.

641205791 is a deficient number, since it is larger than the sum of its proper divisors (9984289).

641205791 is a wasteful number, since it uses less digits than its factorization.

641205791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23425.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 641205791 is about 25322.0416041045. The cubic root of 641205791 is about 862.3147443890.

The spelling of 641205791 in words is "six hundred forty-one million, two hundred five thousand, seven hundred ninety-one".