921169 has 2 divisors, whose sum is σ = 921170. Its totient is φ = 921168.

The previous prime is 921157. The next prime is 921191. The reversal of 921169 is 961129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 744769 + 176400 = 863^2 + 420^2 .

It is a cyclic number.

It is not a de Polignac number, because 921169 - 2¹⁹ = 396881 is a prime.

It is a super-2 number, since 2×921169² = 1697104653122, which contains 22 as substring.

921169 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (921149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460584 + 460585.

It is an arithmetic number, because the mean of its divisors is an integer number (460585).

2⁹²¹¹⁶⁹ is an apocalyptic number.

It is an amenable number.

921169 is a deficient number, since it is larger than the sum of its proper divisors (1).

921169 is an equidigital number, since it uses as much as digits as its factorization.

921169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 28.

The square root of 921169 is about 959.7754945819. The cubic root of 921169 is about 97.3000592566.

The spelling of 921169 in words is "nine hundred twenty-one thousand, one hundred sixty-nine".