278951 has 4 divisors (see below), whose sum is σ = 288600. Its totient is φ = 269304.

The previous prime is 278947. The next prime is 278981. The reversal of 278951 is 159872.

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 278951 - 2² = 278947 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278911) 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, 4781 + ... + 4838.

It is an arithmetic number, because the mean of its divisors is an integer number (72150).

278951 is a Friedman number, since it can be written as 8^(9-2-1)+7^5, using all its digits and the basic arithmetic operations.

2²⁷⁸⁹⁵¹ is an apocalyptic number.

278951 is a deficient number, since it is larger than the sum of its proper divisors (9649).

278951 is an equidigital number, since it uses as much as digits as its factorization.

278951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9648.

The product of its digits is 5040, while the sum is 32.

The square root of 278951 is about 528.1581202632. The cubic root of 278951 is about 65.3395251895.

The spelling of 278951 in words is "two hundred seventy-eight thousand, nine hundred fifty-one".