2543641 has 2 divisors, whose sum is σ = 2543642. Its totient is φ = 2543640.

The previous prime is 2543633. The next prime is 2543647. The reversal of 2543641 is 1463452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2059225 + 484416 = 1435^2 + 696^2 .

It is a cyclic number.

It is not a de Polignac number, because 2543641 - 2³ = 2543633 is a prime.

It is a pancake number, because a pancake can be divided into 2543641 parts by 2255 straight cuts.

It is not a weakly prime, because it can be changed into another prime (2543647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1271820 + 1271821.

It is an arithmetic number, because the mean of its divisors is an integer number (1271821).

2^2543641 is an apocalyptic number.

It is an amenable number.

2543641 is a deficient number, since it is larger than the sum of its proper divisors (1).

2543641 is an equidigital number, since it uses as much as digits as its factorization.

2543641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 25.

The square root of 2543641 is about 1594.8796192817. The cubic root of 2543641 is about 136.5060622478.

The spelling of 2543641 in words is "two million, five hundred forty-three thousand, six hundred forty-one".