255102781 has 4 divisors (see below), whose sum is σ = 255155292. Its totient is φ = 255050272.

The previous prime is 255102773. The next prime is 255102803. The reversal of 255102781 is 187201552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 161671225 + 93431556 = 12715^2 + 9666^2 .

It is a cyclic number.

It is not a de Polignac number, because 255102781 - 2³ = 255102773 is a prime.

It is a super-4 number, since 4×255102781⁴ (a number of 35 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255102761) 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, 18130 + ... + 28963.

It is an arithmetic number, because the mean of its divisors is an integer number (63788823).

Almost surely, 2^255102781 is an apocalyptic number.

It is an amenable number.

255102781 is a deficient number, since it is larger than the sum of its proper divisors (52511).

255102781 is an equidigital number, since it uses as much as digits as its factorization.

255102781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52510.

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 255102781 is about 15971.9372963958. The cubic root of 255102781 is about 634.2177574992.

The spelling of 255102781 in words is "two hundred fifty-five million, one hundred two thousand, seven hundred eighty-one".