266687131 has 4 divisors (see below), whose sum is σ = 266830200. Its totient is φ = 266544064.

The previous prime is 266687129. The next prime is 266687171. The reversal of 266687131 is 131786662.

It is a happy number.

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 266687131 - 2¹ = 266687129 is a prime.

It is a super-2 number, since 2×266687131² = 142244051682022322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266687111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68701 + ... + 72478.

It is an arithmetic number, because the mean of its divisors is an integer number (66707550).

Almost surely, 2^266687131 is an apocalyptic number.

266687131 is a deficient number, since it is larger than the sum of its proper divisors (143069).

266687131 is a wasteful number, since it uses less digits than its factorization.

266687131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143068.

The product of its digits is 72576, while the sum is 40.

The square root of 266687131 is about 16330.5581962161. The cubic root of 266687131 is about 643.6760543964.

The spelling of 266687131 in words is "two hundred sixty-six million, six hundred eighty-seven thousand, one hundred thirty-one".