971921860 has 72 divisors (see below), whose sum is σ = 2556935640. Its totient is φ = 307593216.

The previous prime is 971921857. The next prime is 971921869. The reversal of 971921860 is 68129179.

It can be written as a sum of positive squares in 4 ways, for example, as 16370116 + 955551744 = 4046^2 + 30912^2 .

It is not an unprimeable number, because it can be changed into a prime (971921869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25405 + ... + 50884.

It is an arithmetic number, because the mean of its divisors is an integer number (35512995).

Almost surely, 2^971921860 is an apocalyptic number.

It is an amenable number.

971921860 is an abundant number, since it is smaller than the sum of its proper divisors (1585013780).

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

971921860 is a wasteful number, since it uses less digits than its factorization.

971921860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76325 (or 76316 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 971921860 is about 31175.6613402186. The cubic root of 971921860 is about 990.5516294514.

The spelling of 971921860 in words is "nine hundred seventy-one million, nine hundred twenty-one thousand, eight hundred sixty".