2543161 has 4 divisors (see below), whose sum is σ = 2556532. Its totient is φ = 2529792.

The previous prime is 2543159. The next prime is 2543171. The reversal of 2543161 is 1613452.

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 1115136 + 1428025 = 1056^2 + 1195^2 .

It is a cyclic number.

It is not a de Polignac number, because 2543161 - 2¹ = 2543159 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2543111) 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, 6396 + ... + 6781.

It is an arithmetic number, because the mean of its divisors is an integer number (639133).

2^2543161 is an apocalyptic number.

It is an amenable number.

2543161 is a deficient number, since it is larger than the sum of its proper divisors (13371).

2543161 is a wasteful number, since it uses less digits than its factorization.

2543161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13370.

The product of its digits is 720, while the sum is 22.

The square root of 2543161 is about 1594.7291306049. The cubic root of 2543161 is about 136.4974752090.

It can be divided in two parts, 2543 and 161, that added together give a square (2704 = 52²).

The spelling of 2543161 in words is "two million, five hundred forty-three thousand, one hundred sixty-one".