6321543401 has 4 divisors (see below), whose sum is σ = 6322111572. Its totient is φ = 6320975232.

The previous prime is 6321543379. The next prime is 6321543407. The reversal of 6321543401 is 1043451236.

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 1029126400 + 5292417001 = 32080^2 + 72749^2 .

It is a cyclic number.

It is not a de Polignac number, because 6321543401 - 2¹⁸ = 6321281257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6321543407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267056 + ... + 289761.

It is an arithmetic number, because the mean of its divisors is an integer number (1580527893).

Almost surely, 2^6321543401 is an apocalyptic number.

It is an amenable number.

6321543401 is a deficient number, since it is larger than the sum of its proper divisors (568171).

6321543401 is a wasteful number, since it uses less digits than its factorization.

6321543401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568170.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 6321543401 is about 79508.1341813528. The cubic root of 6321543401 is about 1849.0175841652.

Adding to 6321543401 its reverse (1043451236), we get a palindrome (7364994637).

The spelling of 6321543401 in words is "six billion, three hundred twenty-one million, five hundred forty-three thousand, four hundred one".