6447892141 has 4 divisors (see below), whose sum is σ = 6827179932. Its totient is φ = 6068604352.

The previous prime is 6447892133. The next prime is 6447892147. The reversal of 6447892141 is 1412987446.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5803240041 + 644652100 = 76179^2 + 25390^2 .

It is a cyclic number.

It is not a de Polignac number, because 6447892141 - 2³ = 6447892133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6447892091 and 6447892100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6447892147) 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 in 3 ways as a sum of consecutive naturals, for example, 189643870 + ... + 189643903.

It is an arithmetic number, because the mean of its divisors is an integer number (1706794983).

Almost surely, 2^6447892141 is an apocalyptic number.

It is an amenable number.

6447892141 is a deficient number, since it is larger than the sum of its proper divisors (379287791).

6447892141 is a wasteful number, since it uses less digits than its factorization.

6447892141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379287790.

The product of its digits is 387072, while the sum is 46.

The square root of 6447892141 is about 80298.7679917942. The cubic root of 6447892141 is about 1861.2551882439.

The spelling of 6447892141 in words is "six billion, four hundred forty-seven million, eight hundred ninety-two thousand, one hundred forty-one".