6516401 has 2 divisors, whose sum is σ = 6516402. Its totient is φ = 6516400.

The previous prime is 6516379. The next prime is 6516421. The reversal of 6516401 is 1046156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3418801 + 3097600 = 1849^2 + 1760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6516401 is a prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (6516421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3258200 + 3258201.

It is an arithmetic number, because the mean of its divisors is an integer number (3258201).

Almost surely, 2^6516401 is an apocalyptic number.

It is an amenable number.

6516401 is a deficient number, since it is larger than the sum of its proper divisors (1).

6516401 is an equidigital number, since it uses as much as digits as its factorization.

6516401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 6516401 is about 2552.7242310912. The cubic root of 6516401 is about 186.7823924547.

The spelling of 6516401 in words is "six million, five hundred sixteen thousand, four hundred one".