921143 has 2 divisors, whose sum is σ = 921144. Its totient is φ = 921142.

The previous prime is 921133. The next prime is 921149. The reversal of 921143 is 341129.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 921143 - 2⁶ = 921079 is a prime.

It is a Sophie Germain 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 921143.

It is not a weakly prime, because it can be changed into another prime (921149) 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, 460571 + 460572.

It is an arithmetic number, because the mean of its divisors is an integer number (460572).

2⁹²¹¹⁴³ is an apocalyptic number.

921143 is a deficient number, since it is larger than the sum of its proper divisors (1).

921143 is an equidigital number, since it uses as much as digits as its factorization.

921143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 20.

The square root of 921143 is about 959.7619496521. The cubic root of 921143 is about 97.2991438164.

The spelling of 921143 in words is "nine hundred twenty-one thousand, one hundred forty-three".