2543381 has 2 divisors, whose sum is σ = 2543382. Its totient is φ = 2543380.

The previous prime is 2543371. The next prime is 2543389. The reversal of 2543381 is 1833452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2531281 + 12100 = 1591^2 + 110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2543381 is a prime.

It is a super-2 number, since 2×2543381² = 12937573822322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2543381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2543389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1271690 + 1271691.

It is an arithmetic number, because the mean of its divisors is an integer number (1271691).

2^2543381 is an apocalyptic number.

It is an amenable number.

2543381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2543381 is an equidigital number, since it uses as much as digits as its factorization.

2543381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 26.

The square root of 2543381 is about 1594.7981063445. The cubic root of 2543381 is about 136.5014110692.

The spelling of 2543381 in words is "two million, five hundred forty-three thousand, three hundred eighty-one".