266831 has 4 divisors (see below), whose sum is σ = 268632. Its totient is φ = 265032.

The previous prime is 266821. The next prime is 266837. The reversal of 266831 is 138662.

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 266831 - 2⁶ = 266767 is a prime.

It is a super-2 number, since 2×266831² = 142397565122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 266831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266837) 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, 656 + ... + 981.

It is an arithmetic number, because the mean of its divisors is an integer number (67158).

2²⁶⁶⁸³¹ is an apocalyptic number.

266831 is a deficient number, since it is larger than the sum of its proper divisors (1801).

266831 is a wasteful number, since it uses less digits than its factorization.

266831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800.

The product of its digits is 1728, while the sum is 26.

The square root of 266831 is about 516.5568700540. The cubic root of 266831 is about 64.3791780994.

The spelling of 266831 in words is "two hundred sixty-six thousand, eight hundred thirty-one".