6441261509 has 2 divisors, whose sum is σ = 6441261510. Its totient is φ = 6441261508.

The previous prime is 6441261487. The next prime is 6441261517. The reversal of 6441261509 is 9051621446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5971889284 + 469372225 = 77278^2 + 21665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6441261509 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6441263509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220630754 + 3220630755.

It is an arithmetic number, because the mean of its divisors is an integer number (3220630755).

Almost surely, 2^6441261509 is an apocalyptic number.

It is an amenable number.

6441261509 is a deficient number, since it is larger than the sum of its proper divisors (1).

6441261509 is an equidigital number, since it uses as much as digits as its factorization.

6441261509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 6441261509 is about 80257.4701133795. The cubic root of 6441261509 is about 1860.6169677364.

The spelling of 6441261509 in words is "six billion, four hundred forty-one million, two hundred sixty-one thousand, five hundred nine".