255117261 has 16 divisors (see below), whose sum is σ = 394077824. Its totient is φ = 143783424.

The previous prime is 255117253. The next prime is 255117287. The reversal of 255117261 is 162711552.

It is not a de Polignac number, because 255117261 - 2³ = 255117253 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255117241) 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 15 ways as a sum of consecutive naturals, for example, 81676 + ... + 84741.

It is an arithmetic number, because the mean of its divisors is an integer number (24629864).

Almost surely, 2^255117261 is an apocalyptic number.

255117261 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

255117261 is a deficient number, since it is larger than the sum of its proper divisors (138960563).

255117261 is a wasteful number, since it uses less digits than its factorization.

255117261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166500.

The product of its digits is 4200, while the sum is 30.

The square root of 255117261 is about 15972.3905850064. The cubic root of 255117261 is about 634.2297569755.

The spelling of 255117261 in words is "two hundred fifty-five million, one hundred seventeen thousand, two hundred sixty-one".