2143655161 has 4 divisors (see below), whose sum is σ = 2147504292. Its totient is φ = 2139806032.

The previous prime is 2143655117. The next prime is 2143655167. The reversal of 2143655161 is 1615563412.

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 384356025 + 1759299136 = 19605^2 + 41944^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143655161 - 2²¹ = 2141558009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2143655167) 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, 1923730 + ... + 1924843.

It is an arithmetic number, because the mean of its divisors is an integer number (536876073).

Almost surely, 2^2143655161 is an apocalyptic number.

It is an amenable number.

2143655161 is a deficient number, since it is larger than the sum of its proper divisors (3849131).

2143655161 is an equidigital number, since it uses as much as digits as its factorization.

2143655161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3849130.

The product of its digits is 21600, while the sum is 34.

The square root of 2143655161 is about 46299.6237673699. The cubic root of 2143655161 is about 1289.3920098294.

The spelling of 2143655161 in words is "two billion, one hundred forty-three million, six hundred fifty-five thousand, one hundred sixty-one".