255813961 has 8 divisors (see below), whose sum is σ = 276376520. Its totient is φ = 235377792.

The previous prime is 255813949. The next prime is 255813979. The reversal of 255813961 is 169318552.

It can be written as a sum of positive squares in 4 ways, for example, as 28558336 + 227255625 = 5344^2 + 15075^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 255813961 - 2¹⁵ = 255781193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255813991) 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 7 ways as a sum of consecutive naturals, for example, 27366 + ... + 35503.

It is an arithmetic number, because the mean of its divisors is an integer number (34547065).

Almost surely, 2^255813961 is an apocalyptic number.

It is an amenable number.

255813961 is a deficient number, since it is larger than the sum of its proper divisors (20562559).

255813961 is a wasteful number, since it uses less digits than its factorization.

255813961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63195.

The product of its digits is 64800, while the sum is 40.

The square root of 255813961 is about 15994.1852246371. The cubic root of 255813961 is about 634.8065717921.

The spelling of 255813961 in words is "two hundred fifty-five million, eight hundred thirteen thousand, nine hundred sixty-one".