6891449144 has 32 divisors (see below), whose sum is σ = 13113498240. Its totient is φ = 3394591200.

The previous prime is 6891449143. The next prime is 6891449153. The reversal of 6891449144 is 4419441986.

It is a junction number, because it is equal to n+sod(n) for n = 6891449092 and 6891449101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6891449143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 888467 + ... + 896189.

It is an arithmetic number, because the mean of its divisors is an integer number (409796820).

Almost surely, 2^6891449144 is an apocalyptic number.

It is an amenable number.

6891449144 is a deficient number, since it is larger than the sum of its proper divisors (6222049096).

6891449144 is a wasteful number, since it uses less digits than its factorization.

6891449144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9371 (or 9367 counting only the distinct ones).

The product of its digits is 995328, while the sum is 50.

The square root of 6891449144 is about 83014.7525684441. The cubic root of 6891449144 is about 1902.9915149590.

The spelling of 6891449144 in words is "six billion, eight hundred ninety-one million, four hundred forty-nine thousand, one hundred forty-four".