971888981 has 12 divisors (see below), whose sum is σ = 1131106860. Its totient is φ = 832648320.

The previous prime is 971888947. The next prime is 971888993. The reversal of 971888981 is 189888179.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 613354756 + 358534225 = 24766^2 + 18935^2 .

It is not a de Polignac number, because 971888981 - 2⁶ = 971888917 is a prime.

It is a super-2 number, since 2×971888981² = 1889136382778436722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 971888981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (971888941) 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 11 ways as a sum of consecutive naturals, for example, 148151 + ... + 154571.

It is an arithmetic number, because the mean of its divisors is an integer number (94258905).

Almost surely, 2^971888981 is an apocalyptic number.

It is an amenable number.

971888981 is a deficient number, since it is larger than the sum of its proper divisors (159217879).

971888981 is a wasteful number, since it uses less digits than its factorization.

971888981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9524 (or 9517 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 59.

The square root of 971888981 is about 31175.1340173543. The cubic root of 971888981 is about 990.5404595842.

The spelling of 971888981 in words is "nine hundred seventy-one million, eight hundred eighty-eight thousand, nine hundred eighty-one".