6445131439 has 2 divisors, whose sum is σ = 6445131440. Its totient is φ = 6445131438.

The previous prime is 6445131349. The next prime is 6445131449. The reversal of 6445131439 is 9341315446.

Together with previous prime (6445131349) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6445131439 - 2⁷ = 6445131311 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 polite number, since it can be written as a sum of consecutive naturals, namely, 3222565719 + 3222565720.

It is an arithmetic number, because the mean of its divisors is an integer number (3222565720).

Almost surely, 2^6445131439 is an apocalyptic number.

6445131439 is a deficient number, since it is larger than the sum of its proper divisors (1).

6445131439 is an equidigital number, since it uses as much as digits as its factorization.

6445131439 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 6445131439 is about 80281.5759623589. The cubic root of 6445131439 is about 1860.9895146293.

The spelling of 6445131439 in words is "six billion, four hundred forty-five million, one hundred thirty-one thousand, four hundred thirty-nine".