971921 has 2 divisors, whose sum is σ = 971922. Its totient is φ = 971920.

The previous prime is 971917. The next prime is 971933. The reversal of 971921 is 129179.

971921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 923521 + 48400 = 961^2 + 220^2 .

It is a cyclic number.

It is not a de Polignac number, because 971921 - 2² = 971917 is a prime.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 971921.

It is not a weakly prime, because it can be changed into another prime (971951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485960 + 485961.

It is an arithmetic number, because the mean of its divisors is an integer number (485961).

2⁹⁷¹⁹²¹ is an apocalyptic number.

It is an amenable number.

971921 is a deficient number, since it is larger than the sum of its proper divisors (1).

971921 is an equidigital number, since it uses as much as digits as its factorization.

971921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134, while the sum is 29.

The square root of 971921 is about 985.8605378044. The cubic root of 971921 is about 99.0551337290.

The spelling of 971921 in words is "nine hundred seventy-one thousand, nine hundred twenty-one".