971673921 has 8 divisors (see below), whose sum is σ = 1439516960. Its totient is φ = 647782596.

The previous prime is 971673919. The next prime is 971673931. The reversal of 971673921 is 129376179.

It is not a de Polignac number, because 971673921 - 2¹ = 971673919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (971673931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17993935 + ... + 17993988.

It is an arithmetic number, because the mean of its divisors is an integer number (179939620).

Almost surely, 2^971673921 is an apocalyptic number.

It is an amenable number.

971673921 is a deficient number, since it is larger than the sum of its proper divisors (467843039).

971673921 is a wasteful number, since it uses less digits than its factorization.

971673921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35987932 (or 35987926 counting only the distinct ones).

The product of its digits is 142884, while the sum is 45.

The square root of 971673921 is about 31171.6846031779. The cubic root of 971673921 is about 990.4673917921.

The spelling of 971673921 in words is "nine hundred seventy-one million, six hundred seventy-three thousand, nine hundred twenty-one".