641971539 has 12 divisors (see below), whose sum is σ = 1011591672. Its totient is φ = 389073600.

The previous prime is 641971537. The next prime is 641971549. The reversal of 641971539 is 935179146.

641971539 is a `hidden beast` number, since 6 + 41 + 9 + 71 + 539 = 666.

641971539 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 641971539 - 2¹ = 641971537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 641971494 and 641971503.

It is not an unprimeable number, because it can be changed into a prime (641971531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3242182 + ... + 3242379.

It is an arithmetic number, because the mean of its divisors is an integer number (84299306).

Almost surely, 2^641971539 is an apocalyptic number.

641971539 is a deficient number, since it is larger than the sum of its proper divisors (369620133).

641971539 is a wasteful number, since it uses less digits than its factorization.

641971539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6484578 (or 6484575 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 641971539 is about 25337.1572793792. The cubic root of 641971539 is about 862.6578755739.

The spelling of 641971539 in words is "six hundred forty-one million, nine hundred seventy-one thousand, five hundred thirty-nine".