641554559 has 32 divisors (see below), whose sum is σ = 705438720. Its totient is φ = 582155392.

The previous prime is 641554523. The next prime is 641554577. The reversal of 641554559 is 955455146.

It is not a de Polignac number, because 641554559 - 2¹² = 641550463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641554159) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5995784 + ... + 5995890.

It is an arithmetic number, because the mean of its divisors is an integer number (22044960).

Almost surely, 2^641554559 is an apocalyptic number.

641554559 is a deficient number, since it is larger than the sum of its proper divisors (63884161).

641554559 is a wasteful number, since it uses less digits than its factorization.

641554559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319.

The product of its digits is 540000, while the sum is 44.

The square root of 641554559 is about 25328.9273164104. The cubic root of 641554559 is about 862.4710609628.

The spelling of 641554559 in words is "six hundred forty-one million, five hundred fifty-four thousand, five hundred fifty-nine".