981871911 has 48 divisors (see below), whose sum is σ = 1524407040. Its totient is φ = 607201920.

The previous prime is 981871903. The next prime is 981871939. The reversal of 981871911 is 119178189.

981871911 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 981871911 - 2³ = 981871903 is a prime.

It is a super-2 number, since 2×981871911² = 1928144899221583842, which contains 22 as substring.

Its product of digits (36288) is a multiple of the sum of its prime factors (756).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981871901) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1884331 + ... + 1884851.

It is an arithmetic number, because the mean of its divisors is an integer number (31758480).

Almost surely, 2^981871911 is an apocalyptic number.

981871911 is a deficient number, since it is larger than the sum of its proper divisors (542535129).

981871911 is a wasteful number, since it uses less digits than its factorization.

981871911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756 (or 753 counting only the distinct ones).

The product of its digits is 36288, while the sum is 45.

The square root of 981871911 is about 31334.8354232155. The cubic root of 981871911 is about 993.9204172433.

The spelling of 981871911 in words is "nine hundred eighty-one million, eight hundred seventy-one thousand, nine hundred eleven".