921563 has 2 divisors, whose sum is σ = 921564. Its totient is φ = 921562.

The previous prime is 921523. The next prime is 921581. The reversal of 921563 is 365129.

It is a strong prime.

It is an emirp because it is prime and its reverse (365129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 921563 - 2⁶ = 921499 is a prime.

It is not a weakly prime, because it can be changed into another prime (921523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460781 + 460782.

It is an arithmetic number, because the mean of its divisors is an integer number (460782).

2⁹²¹⁵⁶³ is an apocalyptic number.

921563 is a deficient number, since it is larger than the sum of its proper divisors (1).

921563 is an equidigital number, since it uses as much as digits as its factorization.

921563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 26.

The square root of 921563 is about 959.9807289732. The cubic root of 921563 is about 97.3139295884.

The spelling of 921563 in words is "nine hundred twenty-one thousand, five hundred sixty-three".