920921 has 2 divisors, whose sum is σ = 920922. Its totient is φ = 920920.

The previous prime is 920891. The next prime is 920947. The reversal of 920921 is 129029.

920921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 547600 + 373321 = 740^2 + 611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-920921 is a prime.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 920921.

It is not a weakly prime, because it can be changed into another prime (920951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460460 + 460461.

It is an arithmetic number, because the mean of its divisors is an integer number (460461).

2⁹²⁰⁹²¹ is an apocalyptic number.

It is an amenable number.

920921 is a deficient number, since it is larger than the sum of its proper divisors (1).

920921 is an equidigital number, since it uses as much as digits as its factorization.

920921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 920921 is about 959.6462890044. The cubic root of 920921 is about 97.2913266641.

The spelling of 920921 in words is "nine hundred twenty thousand, nine hundred twenty-one".