6394975321 has 16 divisors (see below), whose sum is σ = 7432381440. Its totient is φ = 5388626880.

The previous prime is 6394975313. The next prime is 6394975333. The reversal of 6394975321 is 1235794936.

It is not a de Polignac number, because 6394975321 - 2³ = 6394975313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6394975421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1208760 + ... + 1214038.

It is an arithmetic number, because the mean of its divisors is an integer number (464523840).

Almost surely, 2^6394975321 is an apocalyptic number.

6394975321 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6394975321 is a deficient number, since it is larger than the sum of its proper divisors (1037406119).

6394975321 is a wasteful number, since it uses less digits than its factorization.

6394975321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8184.

The product of its digits is 1224720, while the sum is 49.

The square root of 6394975321 is about 79968.5895899134. The cubic root of 6394975321 is about 1856.1495209421.

The spelling of 6394975321 in words is "six billion, three hundred ninety-four million, nine hundred seventy-five thousand, three hundred twenty-one".