920975921 has 2 divisors, whose sum is σ = 920975922. Its totient is φ = 920975920.

The previous prime is 920975911. The next prime is 920975953. The reversal of 920975921 is 129579029.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 894309025 + 26666896 = 29905^2 + 5164^2 .

It is an emirp because it is prime and its reverse (129579029) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 920975921 - 2¹⁸ = 920713777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (920975911) 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 as a sum of consecutive naturals, namely, 460487960 + 460487961.

It is an arithmetic number, because the mean of its divisors is an integer number (460487961).

Almost surely, 2^920975921 is an apocalyptic number.

It is an amenable number.

920975921 is a deficient number, since it is larger than the sum of its proper divisors (1).

920975921 is an equidigital number, since it uses as much as digits as its factorization.

920975921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 920975921 is about 30347.5850933810. The cubic root of 920975921 is about 972.9326068117.

The spelling of 920975921 in words is "nine hundred twenty million, nine hundred seventy-five thousand, nine hundred twenty-one".