2159161 has 4 divisors (see below), whose sum is σ = 2162212. Its totient is φ = 2156112.

The previous prime is 2159147. The next prime is 2159177. The reversal of 2159161 is 1619512.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 670761 + 1488400 = 819^2 + 1220^2 .

It is a cyclic number.

It is not a de Polignac number, because 2159161 - 2⁹ = 2158649 is a prime.

It is a Duffinian number.

2159161 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2159191) 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, 151 + ... + 2083.

It is an arithmetic number, because the mean of its divisors is an integer number (540553).

2^2159161 is an apocalyptic number.

It is an amenable number.

2159161 is a deficient number, since it is larger than the sum of its proper divisors (3051).

2159161 is a wasteful number, since it uses less digits than its factorization.

2159161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3050.

The product of its digits is 540, while the sum is 25.

The square root of 2159161 is about 1469.4083843507. The cubic root of 2159161 is about 129.2493424687.

The spelling of 2159161 in words is "two million, one hundred fifty-nine thousand, one hundred sixty-one".