920891 has 2 divisors, whose sum is σ = 920892. Its totient is φ = 920890.

The previous prime is 920869. The next prime is 920921. The reversal of 920891 is 198029.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 920891 - 2⁶ = 920827 is a prime.

It is a Sophie Germain 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 920891.

It is not a weakly prime, because it can be changed into another prime (920291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460445 + 460446.

It is an arithmetic number, because the mean of its divisors is an integer number (460446).

2⁹²⁰⁸⁹¹ is an apocalyptic number.

920891 is a deficient number, since it is larger than the sum of its proper divisors (1).

920891 is an equidigital number, since it uses as much as digits as its factorization.

920891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 920891 is about 959.6306581180. The cubic root of 920891 is about 97.2902701958.

The spelling of 920891 in words is "nine hundred twenty thousand, eight hundred ninety-one".