255866131 has 4 divisors (see below), whose sum is σ = 255900064. Its totient is φ = 255832200.

The previous prime is 255866129. The next prime is 255866173. The reversal of 255866131 is 131668552.

255866131 is a nontrivial binomial coefficient, being equal to C(22622, 2).

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a 3-Lehmer number, since φ(255866131) divides (255866131-1)³.

It is a cyclic number.

It is not a de Polignac number, because 255866131 - 2¹ = 255866129 is a prime.

It is a super-2 number, since 2×255866131² = 130934953985818322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (255816131) 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, 1 + ... + 22621.

It is an arithmetic number, because the mean of its divisors is an integer number (63975016).

Almost surely, 2^255866131 is an apocalyptic number.

255866131 is the 22621-st triangular number and also the 11311-st hexagonal number.

255866131 is the 7541-st centered nonagonal number.

255866131 is a deficient number, since it is larger than the sum of its proper divisors (33933).

255866131 is a wasteful number, since it uses less digits than its factorization.

255866131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33932.

The product of its digits is 43200, while the sum is 37.

The square root of 255866131 is about 15995.8160467042. The cubic root of 255866131 is about 634.8497224313.

The spelling of 255866131 in words is "two hundred fifty-five million, eight hundred sixty-six thousand, one hundred thirty-one".