2678549 has 2 divisors, whose sum is σ = 2678550. Its totient is φ = 2678548.

The previous prime is 2678539. The next prime is 2678551. The reversal of 2678549 is 9458762.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2582449 + 96100 = 1607^2 + 310^2 .

It is a cyclic number.

It is not a de Polignac number, because 2678549 - 2¹² = 2674453 is a prime.

Together with 2678551, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2678519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1339274 + 1339275.

It is an arithmetic number, because the mean of its divisors is an integer number (1339275).

2^2678549 is an apocalyptic number.

It is an amenable number.

2678549 is a deficient number, since it is larger than the sum of its proper divisors (1).

2678549 is an equidigital number, since it uses as much as digits as its factorization.

2678549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 41.

The square root of 2678549 is about 1636.6273247138. The cubic root of 2678549 is about 138.8779184461.

The spelling of 2678549 in words is "two million, six hundred seventy-eight thousand, five hundred forty-nine".