921000169 has 2 divisors, whose sum is σ = 921000170. Its totient is φ = 921000168.

The previous prime is 921000163. The next prime is 921000191. The reversal of 921000169 is 961000129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 730891225 + 190108944 = 27035^2 + 13788^2 .

It is an emirp because it is prime and its reverse (961000129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 921000169 - 2³ = 921000161 is a prime.

It is a super-2 number, since 2×921000169² = 1696482622596057122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (921000161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460500084 + 460500085.

It is an arithmetic number, because the mean of its divisors is an integer number (460500085).

Almost surely, 2^921000169 is an apocalyptic number.

It is an amenable number.

921000169 is a deficient number, since it is larger than the sum of its proper divisors (1).

921000169 is an equidigital number, since it uses as much as digits as its factorization.

921000169 is an odious number, because the sum of its binary digits is odd.

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

The square root of 921000169 is about 30347.9845953566. The cubic root of 921000169 is about 972.9411453856.

The spelling of 921000169 in words is "nine hundred twenty-one million, one hundred sixty-nine", and thus it is an aban number.