2161423115 has 4 divisors (see below), whose sum is σ = 2593707744. Its totient is φ = 1729138488.

The previous prime is 2161423111. The next prime is 2161423123. The reversal of 2161423115 is 5113241612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2161423115 - 2² = 2161423111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161423111) 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 3 ways as a sum of consecutive naturals, for example, 216142307 + ... + 216142316.

It is an arithmetic number, because the mean of its divisors is an integer number (648426936).

Almost surely, 2^2161423115 is an apocalyptic number.

2161423115 is a deficient number, since it is larger than the sum of its proper divisors (432284629).

2161423115 is an equidigital number, since it uses as much as digits as its factorization.

2161423115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432284628.

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

The square root of 2161423115 is about 46491.1079132343. The cubic root of 2161423115 is about 1292.9446413547.

Adding to 2161423115 its reverse (5113241612), we get a palindrome (7274664727).

The spelling of 2161423115 in words is "two billion, one hundred sixty-one million, four hundred twenty-three thousand, one hundred fifteen".