899220169 has 9 divisors (see below), whose sum is σ = 909747111. Its totient is φ = 888814680.

The previous prime is 899220143. The next prime is 899220173. The reversal of 899220169 is 961022998.

The square root of 899220169 is 29987.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 263575225 + 635644944 = 16235^2 + 25212^2 .

It is not a de Polignac number, because 899220169 - 2¹³ = 899211977 is a prime.

It is a super-2 number, since 2×899220169² = 1617193824672777122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (899220769) 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 8 ways as a sum of consecutive naturals, for example, 4707864 + ... + 4708054.

Almost surely, 2^899220169 is an apocalyptic number.

899220169 is the 29987-th square number.

899220169 is the 14994-th centered octagonal number.

It is an amenable number.

899220169 is a deficient number, since it is larger than the sum of its proper divisors (10526942).

899220169 is an frugal number, since it uses more digits than its factorization.

899220169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696 (or 348 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The cubic root of 899220169 is about 965.2104453020.

It can be divided in two parts, 8992 and 20169, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 899220169 in words is "eight hundred ninety-nine million, two hundred twenty thousand, one hundred sixty-nine".