266731 has 4 divisors (see below), whose sum is σ = 278352. Its totient is φ = 255112.

The previous prime is 266719. The next prime is 266759. The reversal of 266731 is 137662.

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 266731 - 2⁷ = 266603 is a prime.

It is a super-2 number, since 2×266731² = 142290852722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 266696 and 266705.

It is not an unprimeable number, because it can be changed into a prime (266701) 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, 5776 + ... + 5821.

It is an arithmetic number, because the mean of its divisors is an integer number (69588).

2²⁶⁶⁷³¹ is an apocalyptic number.

266731 is a deficient number, since it is larger than the sum of its proper divisors (11621).

266731 is a wasteful number, since it uses less digits than its factorization.

266731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11620.

The product of its digits is 1512, while the sum is 25.

The square root of 266731 is about 516.4600662200. The cubic root of 266731 is about 64.3711346534.

The spelling of 266731 in words is "two hundred sixty-six thousand, seven hundred thirty-one".