255352781 has 4 divisors (see below), whose sum is σ = 260170812. Its totient is φ = 250534752.

The previous prime is 255352777. The next prime is 255352813. The reversal of 255352781 is 187253552.

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 144240100 + 111112681 = 12010^2 + 10541^2 .

It is a cyclic number.

It is not a de Polignac number, because 255352781 - 2² = 255352777 is a prime.

It is a super-2 number, since 2×255352781² = 130410085528867922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255355781) 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, 2408936 + ... + 2409041.

It is an arithmetic number, because the mean of its divisors is an integer number (65042703).

Almost surely, 2^255352781 is an apocalyptic number.

It is an amenable number.

255352781 is a deficient number, since it is larger than the sum of its proper divisors (4818031).

255352781 is an equidigital number, since it uses as much as digits as its factorization.

255352781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4818030.

The product of its digits is 84000, while the sum is 38.

The square root of 255352781 is about 15979.7616064821. The cubic root of 255352781 is about 634.4248670580.

The spelling of 255352781 in words is "two hundred fifty-five million, three hundred fifty-two thousand, seven hundred eighty-one".