6449993321 has 4 divisors (see below), whose sum is σ = 6450316032. Its totient is φ = 6449670612.

The previous prime is 6449993317. The next prime is 6449993371. The reversal of 6449993321 is 1233999446.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6449993321 - 2² = 6449993317 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 6449993321.

It is not an unprimeable number, because it can be changed into a prime (6449993371) 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, 129245 + ... + 172058.

It is an arithmetic number, because the mean of its divisors is an integer number (1612579008).

Almost surely, 2^6449993321 is an apocalyptic number.

It is an amenable number.

6449993321 is a deficient number, since it is larger than the sum of its proper divisors (322711).

6449993321 is a wasteful number, since it uses less digits than its factorization.

6449993321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322710.

The product of its digits is 1259712, while the sum is 50.

The square root of 6449993321 is about 80311.8504393966. The cubic root of 6449993321 is about 1861.4573425480.

The spelling of 6449993321 in words is "six billion, four hundred forty-nine million, nine hundred ninety-three thousand, three hundred twenty-one".