8641729013 has 4 divisors (see below), whose sum is σ = 8641977708. Its totient is φ = 8641480320.

The previous prime is 8641729009. The next prime is 8641729021. The reversal of 8641729013 is 3109271468.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 392911684 + 8248817329 = 19822^2 + 90823^2 .

It is a cyclic number.

It is not a de Polignac number, because 8641729013 - 2² = 8641729009 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 (8641719013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61706 + ... + 145227.

It is an arithmetic number, because the mean of its divisors is an integer number (2160494427).

Almost surely, 2^8641729013 is an apocalyptic number.

It is an amenable number.

8641729013 is a deficient number, since it is larger than the sum of its proper divisors (248695).

8641729013 is a wasteful number, since it uses less digits than its factorization.

8641729013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248694.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 8641729013 is about 92960.9004528248. The cubic root of 8641729013 is about 2052.1080051529.

The spelling of 8641729013 in words is "eight billion, six hundred forty-one million, seven hundred twenty-nine thousand, thirteen".