921667 has 2 divisors, whose sum is σ = 921668. Its totient is φ = 921666.

The previous prime is 921647. The next prime is 921677. The reversal of 921667 is 766129.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 921667 - 2¹⁹ = 397379 is a prime.

It is not a weakly prime, because it can be changed into another prime (921637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460833 + 460834.

It is an arithmetic number, because the mean of its divisors is an integer number (460834).

2⁹²¹⁶⁶⁷ is an apocalyptic number.

921667 is a deficient number, since it is larger than the sum of its proper divisors (1).

921667 is an equidigital number, since it uses as much as digits as its factorization.

921667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 31.

The square root of 921667 is about 960.0348951991. The cubic root of 921667 is about 97.3175901332.

The spelling of 921667 in words is "nine hundred twenty-one thousand, six hundred sixty-seven".