2549381 has 2 divisors, whose sum is σ = 2549382. Its totient is φ = 2549380.

The previous prime is 2549369. The next prime is 2549383. The reversal of 2549381 is 1839452.

2549381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1677025 + 872356 = 1295^2 + 934^2 .

It is a cyclic number.

It is not a de Polignac number, because 2549381 - 2⁶ = 2549317 is a prime.

It is a super-3 number, since 3×2549381³ = 49707908365333420023, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

Together with 2549383, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2549383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1274690 + 1274691.

It is an arithmetic number, because the mean of its divisors is an integer number (1274691).

2^2549381 is an apocalyptic number.

It is an amenable number.

2549381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2549381 is an equidigital number, since it uses as much as digits as its factorization.

2549381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 2549381 is about 1596.6781140856. The cubic root of 2549381 is about 136.6086653209.

The spelling of 2549381 in words is "two million, five hundred forty-nine thousand, three hundred eighty-one".