266251 has 4 divisors (see below), whose sum is σ = 267904. Its totient is φ = 264600.

The previous prime is 266239. The next prime is 266261. The reversal of 266251 is 152662.

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 266251 - 2⁹ = 265739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266221) 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 3 ways as a sum of consecutive naturals, for example, 555 + ... + 916.

It is an arithmetic number, because the mean of its divisors is an integer number (66976).

2²⁶⁶²⁵¹ is an apocalyptic number.

266251 is a deficient number, since it is larger than the sum of its proper divisors (1653).

266251 is a wasteful number, since it uses less digits than its factorization.

266251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652.

The product of its digits is 720, while the sum is 22.

The square root of 266251 is about 515.9951550160. The cubic root of 266251 is about 64.3324981025.

It can be divided in two parts, 266 and 251, that multiplied together give a palindrome (66766).

The spelling of 266251 in words is "two hundred sixty-six thousand, two hundred fifty-one".