831985169 has 2 divisors, whose sum is σ = 831985170. Its totient is φ = 831985168.

The previous prime is 831985153. The next prime is 831985181. The reversal of 831985169 is 961589138.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 789891025 + 42094144 = 28105^2 + 6488^2 .

It is a cyclic number.

It is not a de Polignac number, because 831985169 - 2⁴ = 831985153 is a prime.

It is a super-2 number, since 2×831985169² = 1384398642871917122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (831985109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415992584 + 415992585.

It is an arithmetic number, because the mean of its divisors is an integer number (415992585).

Almost surely, 2^831985169 is an apocalyptic number.

It is an amenable number.

831985169 is a deficient number, since it is larger than the sum of its proper divisors (1).

831985169 is an equidigital number, since it uses as much as digits as its factorization.

831985169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 50.

The square root of 831985169 is about 28844.1531163596. The cubic root of 831985169 is about 940.5282864902.

The spelling of 831985169 in words is "eight hundred thirty-one million, nine hundred eighty-five thousand, one hundred sixty-nine".