255691311 has 4 divisors (see below), whose sum is σ = 340921752. Its totient is φ = 170460872.

The previous prime is 255691307. The next prime is 255691357. The reversal of 255691311 is 113196552.

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 255691311 - 2² = 255691307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255691361) 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, 42615216 + ... + 42615221.

It is an arithmetic number, because the mean of its divisors is an integer number (85230438).

Almost surely, 2^255691311 is an apocalyptic number.

255691311 is a deficient number, since it is larger than the sum of its proper divisors (85230441).

255691311 is an equidigital number, since it uses as much as digits as its factorization.

255691311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85230440.

The product of its digits is 8100, while the sum is 33.

The square root of 255691311 is about 15990.3505590090. The cubic root of 255691311 is about 634.7051029067.

The spelling of 255691311 in words is "two hundred fifty-five million, six hundred ninety-one thousand, three hundred eleven".