2891447889 has 8 divisors (see below), whose sum is σ = 4205742432. Its totient is φ = 1752392640.

The previous prime is 2891447857. The next prime is 2891447893. The reversal of 2891447889 is 9887441982.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2891447889 - 2⁵ = 2891447857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2891447809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43809784 + ... + 43809849.

It is an arithmetic number, because the mean of its divisors is an integer number (525717804).

Almost surely, 2^2891447889 is an apocalyptic number.

It is an amenable number.

2891447889 is a deficient number, since it is larger than the sum of its proper divisors (1314294543).

2891447889 is a wasteful number, since it uses less digits than its factorization.

2891447889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87619647.

The product of its digits is 9289728, while the sum is 60.

The square root of 2891447889 is about 53772.1850867156. The cubic root of 2891447889 is about 1424.6399646903.

The spelling of 2891447889 in words is "two billion, eight hundred ninety-one million, four hundred forty-seven thousand, eight hundred eighty-nine".