6445131349 has 2 divisors, whose sum is σ = 6445131350. Its totient is φ = 6445131348.

The previous prime is 6445131317. The next prime is 6445131439. The reversal of 6445131349 is 9431315446.

Together with next prime (6445131439) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6370913124 + 74218225 = 79818^2 + 8615^2 .

It is a cyclic number.

It is not a de Polignac number, because 6445131349 - 2⁵ = 6445131317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6445131449) 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, 3222565674 + 3222565675.

It is an arithmetic number, because the mean of its divisors is an integer number (3222565675).

Almost surely, 2^6445131349 is an apocalyptic number.

It is an amenable number.

6445131349 is a deficient number, since it is larger than the sum of its proper divisors (1).

6445131349 is an equidigital number, since it uses as much as digits as its factorization.

6445131349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 40.

The square root of 6445131349 is about 80281.5754018318. The cubic root of 6445131349 is about 1860.9895059670.

The spelling of 6445131349 in words is "six billion, four hundred forty-five million, one hundred thirty-one thousand, three hundred forty-nine".