641009529 has 12 divisors (see below), whose sum is σ = 935071332. Its totient is φ = 423108000.

The previous prime is 641009519. The next prime is 641009543. The reversal of 641009529 is 925900146.

641009529 is a `hidden beast` number, since 641 + 0 + 0 + 9 + 5 + 2 + 9 = 666.

641009529 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 396806400 + 244203129 = 19920^2 + 15627^2 .

It is not a de Polignac number, because 641009529 - 2¹² = 641005433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 641009493 and 641009502.

It is not an unprimeable number, because it can be changed into a prime (641009519) 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, 351682 + ... + 353499.

It is an arithmetic number, because the mean of its divisors is an integer number (77922611).

Almost surely, 2^641009529 is an apocalyptic number.

It is an amenable number.

641009529 is a deficient number, since it is larger than the sum of its proper divisors (294061803).

641009529 is a wasteful number, since it uses less digits than its factorization.

641009529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705288 (or 705285 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 641009529 is about 25318.1659880806. The cubic root of 641009529 is about 862.2267555359.

The spelling of 641009529 in words is "six hundred forty-one million, nine thousand, five hundred twenty-nine".