641205959 has 4 divisors (see below), whose sum is σ = 648931416. Its totient is φ = 633480504.

The previous prime is 641205941. The next prime is 641205973. The reversal of 641205959 is 959502146.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 959502146 = 2 ⋅479751073.

It is a cyclic number.

It is not a de Polignac number, because 641205959 - 2¹² = 641201863 is a prime.

It is a super-2 number, since 2×641205959² = 822290163714219362, 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 (641205919) 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 3 ways as a sum of consecutive naturals, for example, 3862604 + ... + 3862769.

It is an arithmetic number, because the mean of its divisors is an integer number (162232854).

Almost surely, 2^641205959 is an apocalyptic number.

641205959 is a deficient number, since it is larger than the sum of its proper divisors (7725457).

641205959 is an equidigital number, since it uses as much as digits as its factorization.

641205959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7725456.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 641205959 is about 25322.0449213724. The cubic root of 641205959 is about 862.3148196996.

The spelling of 641205959 in words is "six hundred forty-one million, two hundred five thousand, nine hundred fifty-nine".