2161041169 has 27 divisors (see below), whose sum is σ = 2614957137. Its totient is φ = 1780638048.

The previous prime is 2161041149. The next prime is 2161041191. The reversal of 2161041169 is 9611401612.

The square root of 2161041169 is 46487.

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

It can be written as a sum of positive squares in 4 ways, for example, as 580183569 + 1580857600 = 24087^2 + 39760^2 .

It is not a de Polignac number, because 2161041169 - 2¹¹ = 2161039121 is a prime.

It is a super-2 number, since 2×2161041169² = 9340197868225773122, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2161041169.

It is not an unprimeable number, because it can be changed into a prime (2161041109) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 9436747 + ... + 9436975.

Almost surely, 2^2161041169 is an apocalyptic number.

2161041169 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

2161041169 is the 46487-th square number.

2161041169 is the 23244-th centered octagonal number.

It is an amenable number.

2161041169 is a deficient number, since it is larger than the sum of its proper divisors (453915968).

2161041169 is an frugal number, since it uses more digits than its factorization.

2161041169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The cubic root of 2161041169 is about 1292.8684779353.

The spelling of 2161041169 in words is "two billion, one hundred sixty-one million, forty-one thousand, one hundred sixty-nine".