3649108321 has 4 divisors (see below), whose sum is σ = 3668015812. Its totient is φ = 3630200832.

The previous prime is 3649108319. The next prime is 3649108343. The reversal of 3649108321 is 1238019463.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1238019463 = 853 ⋅1451371.

It can be written as a sum of positive squares in 2 ways, for example, as 2073891600 + 1575216721 = 45540^2 + 39689^2 .

It is a cyclic number.

It is not a de Polignac number, because 3649108321 - 2¹ = 3649108319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3649108391) 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, 9453456 + ... + 9453841.

It is an arithmetic number, because the mean of its divisors is an integer number (917003953).

Almost surely, 2^3649108321 is an apocalyptic number.

It is an amenable number.

3649108321 is a deficient number, since it is larger than the sum of its proper divisors (18907491).

3649108321 is a wasteful number, since it uses less digits than its factorization.

3649108321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18907490.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 3649108321 is about 60407.8498293061. The cubic root of 3649108321 is about 1539.5563349205.

The spelling of 3649108321 in words is "three billion, six hundred forty-nine million, one hundred eight thousand, three hundred twenty-one".