278231 has 4 divisors (see below), whose sum is σ = 290352. Its totient is φ = 266112.

The previous prime is 278227. The next prime is 278233. The reversal of 278231 is 132872.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 278231 - 2² = 278227 is a prime.

It is a super-2 number, since 2×278231² = 154824978722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 12097 = 278231 / (2 + 7 + 8 + 2 + 3 + 1).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 278197 and 278206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6026 + ... + 6071.

It is an arithmetic number, because the mean of its divisors is an integer number (72588).

2²⁷⁸²³¹ is an apocalyptic number.

278231 is a deficient number, since it is larger than the sum of its proper divisors (12121).

278231 is a wasteful number, since it uses less digits than its factorization.

278231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12120.

The product of its digits is 672, while the sum is 23.

The square root of 278231 is about 527.4760658077. The cubic root of 278231 is about 65.2832608375.

The spelling of 278231 in words is "two hundred seventy-eight thousand, two hundred thirty-one".