985018169 has 2 divisors, whose sum is σ = 985018170. Its totient is φ = 985018168.

The previous prime is 985018163. The next prime is 985018201. The reversal of 985018169 is 961810589.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 797328169 + 187690000 = 28237^2 + 13700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-985018169 is a prime.

It is a super-2 number, since 2×985018169² = 1940521586520225122, which contains 22 as substring.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (985018163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492509084 + 492509085.

It is an arithmetic number, because the mean of its divisors is an integer number (492509085).

Almost surely, 2^985018169 is an apocalyptic number.

It is an amenable number.

985018169 is a deficient number, since it is larger than the sum of its proper divisors (1).

985018169 is an equidigital number, since it uses as much as digits as its factorization.

985018169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 47.

The square root of 985018169 is about 31384.9991078541. Note that the first 3 decimals coincide. The cubic root of 985018169 is about 994.9809071865.

The spelling of 985018169 in words is "nine hundred eighty-five million, eighteen thousand, one hundred sixty-nine".