278149 has 2 divisors, whose sum is σ = 278150. Its totient is φ = 278148.

The previous prime is 278147. The next prime is 278177. The reversal of 278149 is 941872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 245025 + 33124 = 495^2 + 182^2 .

It is a cyclic number.

It is not a de Polignac number, because 278149 - 2¹ = 278147 is a prime.

Together with 278147, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 278149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139074 + 139075.

It is an arithmetic number, because the mean of its divisors is an integer number (139075).

2²⁷⁸¹⁴⁹ is an apocalyptic number.

It is an amenable number.

278149 is a deficient number, since it is larger than the sum of its proper divisors (1).

278149 is an equidigital number, since it uses as much as digits as its factorization.

278149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 31.

The square root of 278149 is about 527.3983314346. The cubic root of 278149 is about 65.2768467986.

The spelling of 278149 in words is "two hundred seventy-eight thousand, one hundred forty-nine".