6445131383 has 4 divisors (see below), whose sum is σ = 6533420928. Its totient is φ = 6356841840.

The previous prime is 6445131349. The next prime is 6445131439. The reversal of 6445131383 is 3831315446.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6445131383 - 2¹² = 6445127287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6445131083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44144663 + ... + 44144808.

It is an arithmetic number, because the mean of its divisors is an integer number (1633355232).

Almost surely, 2^6445131383 is an apocalyptic number.

6445131383 is a deficient number, since it is larger than the sum of its proper divisors (88289545).

6445131383 is an equidigital number, since it uses as much as digits as its factorization.

6445131383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88289544.

The product of its digits is 103680, while the sum is 38.

The square root of 6445131383 is about 80281.5756135865. The cubic root of 6445131383 is about 1860.9895092394.

The spelling of 6445131383 in words is "six billion, four hundred forty-five million, one hundred thirty-one thousand, three hundred eighty-three".