251278 has 4 divisors (see below), whose sum is σ = 376920. Its totient is φ = 125638.

The previous prime is 251263. The next prime is 251287. The reversal of 251278 is 872152.

251278 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62818 + ... + 62821.

It is an arithmetic number, because the mean of its divisors is an integer number (94230).

2²⁵¹²⁷⁸ is an apocalyptic number.

251278 is a deficient number, since it is larger than the sum of its proper divisors (125642).

251278 is a wasteful number, since it uses less digits than its factorization.

251278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125641.

The product of its digits is 1120, while the sum is 25.

The square root of 251278 is about 501.2763708774. The cubic root of 251278 is about 63.1032153696.

It can be divided in two parts, 251 and 278, that added together give a square (529 = 23²).

The spelling of 251278 in words is "two hundred fifty-one thousand, two hundred seventy-eight".