266805131 has 4 divisors (see below), whose sum is σ = 267980712. Its totient is φ = 265629552.

The previous prime is 266805073. The next prime is 266805151. The reversal of 266805131 is 131508662.

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 266805131 - 2²⁶ = 199696267 is a prime.

It is a super-2 number, since 2×266805131² = 142369955855854322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266805151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 587450 + ... + 587903.

It is an arithmetic number, because the mean of its divisors is an integer number (66995178).

Almost surely, 2^266805131 is an apocalyptic number.

266805131 is a deficient number, since it is larger than the sum of its proper divisors (1175581).

266805131 is a wasteful number, since it uses less digits than its factorization.

266805131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175580.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 266805131 is about 16334.1706554083. The cubic root of 266805131 is about 643.7709753306.

The spelling of 266805131 in words is "two hundred sixty-six million, eight hundred five thousand, one hundred thirty-one".