3647821145329 has 3 divisors (see below), whose sum is σ = 3647823055257. Its totient is φ = 3647819235402.

The previous prime is 3647821145323. The next prime is 3647821145341. The reversal of 3647821145329 is 9235411287463.

The square root of 3647821145329 is 1909927.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 3647821145329 - 2¹⁵ = 3647821112561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3647821145329.

It is not an unprimeable number, because it can be changed into a prime (3647821145323) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 954964 + ... + 2864890.

It is an arithmetic number, because the mean of its divisors is an integer number (1215941018419).

Almost surely, 2^{3647821145329} is an apocalyptic number.

3647821145329 is the 1909927-th square number.

3647821145329 is the 954964-th centered octagonal number.

It is an amenable number.

3647821145329 is a deficient number, since it is larger than the sum of its proper divisors (1909928).

3647821145329 is an frugal number, since it uses more digits than its factorization.

3647821145329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3819854 (or 1909927 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 55.

The spelling of 3647821145329 in words is "three trillion, six hundred forty-seven billion, eight hundred twenty-one million, one hundred forty-five thousand, three hundred twenty-nine".