6491304641 has 2 divisors, whose sum is σ = 6491304642. Its totient is φ = 6491304640.

The previous prime is 6491304637. The next prime is 6491304653. The reversal of 6491304641 is 1464031946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3340840000 + 3150464641 = 57800^2 + 56129^2 .

It is a cyclic number.

It is not a de Polignac number, because 6491304641 - 2² = 6491304637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6491304595 and 6491304604.

It is not a weakly prime, because it can be changed into another prime (6491304661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3245652320 + 3245652321.

It is an arithmetic number, because the mean of its divisors is an integer number (3245652321).

Almost surely, 2^6491304641 is an apocalyptic number.

It is an amenable number.

6491304641 is a deficient number, since it is larger than the sum of its proper divisors (1).

6491304641 is an equidigital number, since it uses as much as digits as its factorization.

6491304641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 6491304641 is about 80568.6331086733. The cubic root of 6491304641 is about 1865.4230141092.

The spelling of 6491304641 in words is "six billion, four hundred ninety-one million, three hundred four thousand, six hundred forty-one".