981271844 has 18 divisors (see below), whose sum is σ = 1997589510. Its totient is φ = 420544992.

The previous prime is 981271843. The next prime is 981271849. The reversal of 981271844 is 448172189.

It can be written as a sum of positive squares in only one way, i.e., 819676900 + 161594944 = 28630^2 + 12712^2 .

It is a junction number, because it is equal to n+sod(n) for n = 981271795 and 981271804.

It is not an unprimeable number, because it can be changed into a prime (981271843) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2503049 + ... + 2503440.

It is an arithmetic number, because the mean of its divisors is an integer number (110977195).

Almost surely, 2^981271844 is an apocalyptic number.

It is an amenable number.

981271844 is an abundant number, since it is smaller than the sum of its proper divisors (1016317666).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

981271844 is a wasteful number, since it uses less digits than its factorization.

981271844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5006507 (or 5006498 counting only the distinct ones).

The product of its digits is 129024, while the sum is 44.

The square root of 981271844 is about 31325.2588816118. The cubic root of 981271844 is about 993.7178991833.

The spelling of 981271844 in words is "nine hundred eighty-one million, two hundred seventy-one thousand, eight hundred forty-four".