2161168469 has 4 divisors (see below), whose sum is σ = 2288296044. Its totient is φ = 2034040896.

The previous prime is 2161168463. The next prime is 2161168489. The reversal of 2161168469 is 9648611612.

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 1263447025 + 897721444 = 35545^2 + 29962^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161168469 - 2⁴ = 2161168453 is a prime.

It is a super-2 number, since 2×2161168469² = 9341298302799607922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161168463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63563762 + ... + 63563795.

It is an arithmetic number, because the mean of its divisors is an integer number (572074011).

Almost surely, 2^2161168469 is an apocalyptic number.

It is an amenable number.

2161168469 is a deficient number, since it is larger than the sum of its proper divisors (127127575).

2161168469 is a wasteful number, since it uses less digits than its factorization.

2161168469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127127574.

The product of its digits is 124416, while the sum is 44.

The square root of 2161168469 is about 46488.3691798282. The cubic root of 2161168469 is about 1292.8938636812.

The spelling of 2161168469 in words is "two billion, one hundred sixty-one million, one hundred sixty-eight thousand, four hundred sixty-nine".