2261120165 has 4 divisors (see below), whose sum is σ = 2713344204. Its totient is φ = 1808896128.

The previous prime is 2261120153. The next prime is 2261120167. The reversal of 2261120165 is 5610211622.

2261120165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 333646756 + 1927473409 = 18266^2 + 43903^2 .

It is a cyclic number.

It is not a de Polignac number, because 2261120165 - 2⁶ = 2261120101 is a prime.

It is a super-2 number, since 2×2261120165² = 10225328801139254450, 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 (2261120167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226112012 + ... + 226112021.

It is an arithmetic number, because the mean of its divisors is an integer number (678336051).

Almost surely, 2^2261120165 is an apocalyptic number.

It is an amenable number.

2261120165 is a deficient number, since it is larger than the sum of its proper divisors (452224039).

2261120165 is an equidigital number, since it uses as much as digits as its factorization.

2261120165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452224038.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 2261120165 is about 47551.2372604541. The cubic root of 2261120165 is about 1312.5258968738.

Adding to 2261120165 its reverse (5610211622), we get a palindrome (7871331787).

The spelling of 2261120165 in words is "two billion, two hundred sixty-one million, one hundred twenty thousand, one hundred sixty-five".