278541 has 6 divisors (see below), whose sum is σ = 402350. Its totient is φ = 185688.

The previous prime is 278503. The next prime is 278543. The reversal of 278541 is 145872.

It can be written as a sum of positive squares in only one way, i.e., 275625 + 2916 = 525^2 + 54^2 .

It is not a de Polignac number, because 278541 - 2⁷ = 278413 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15466 + ... + 15483.

2²⁷⁸⁵⁴¹ is an apocalyptic number.

It is an amenable number.

278541 is a deficient number, since it is larger than the sum of its proper divisors (123809).

278541 is a wasteful number, since it uses less digits than its factorization.

278541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30955 (or 30952 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 278541 is about 527.7698361976. The cubic root of 278541 is about 65.3074976519.

The spelling of 278541 in words is "two hundred seventy-eight thousand, five hundred forty-one".