820027169 has 4 divisors (see below), whose sum is σ = 883106196. Its totient is φ = 756948144.

The previous prime is 820027151. The next prime is 820027193. The reversal of 820027169 is 961720028.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 98406400 + 721620769 = 9920^2 + 26863^2 .

It is a cyclic number.

It is not a de Polignac number, because 820027169 - 2⁸ = 820026913 is a prime.

It is a super-2 number, since 2×820027169² = 1344889115796309122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820027139) 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 in 3 ways as a sum of consecutive naturals, for example, 31539494 + ... + 31539519.

It is an arithmetic number, because the mean of its divisors is an integer number (220776549).

Almost surely, 2^820027169 is an apocalyptic number.

It is an amenable number.

820027169 is a deficient number, since it is larger than the sum of its proper divisors (63079027).

820027169 is a wasteful number, since it uses less digits than its factorization.

820027169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63079026.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 820027169 is about 28636.1165139409. The cubic root of 820027169 is about 936.0004995645. Note that the first 3 decimals are identical.

The spelling of 820027169 in words is "eight hundred twenty million, twenty-seven thousand, one hundred sixty-nine".