255250781 has 2 divisors, whose sum is σ = 255250782. Its totient is φ = 255250780.

The previous prime is 255250777. The next prime is 255250783. The reversal of 255250781 is 187052552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202920025 + 52330756 = 14245^2 + 7234^2 .

It is a cyclic number.

It is not a de Polignac number, because 255250781 - 2² = 255250777 is a prime.

It is a super-2 number, since 2×255250781² = 130305922402219922, which contains 22 as substring.

Together with 255250783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255250783) 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 as a sum of consecutive naturals, namely, 127625390 + 127625391.

It is an arithmetic number, because the mean of its divisors is an integer number (127625391).

Almost surely, 2^255250781 is an apocalyptic number.

It is an amenable number.

255250781 is a deficient number, since it is larger than the sum of its proper divisors (1).

255250781 is an equidigital number, since it uses as much as digits as its factorization.

255250781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28000, while the sum is 35.

The square root of 255250781 is about 15976.5697507319. The cubic root of 255250781 is about 634.3403826904.

The spelling of 255250781 in words is "two hundred fifty-five million, two hundred fifty thousand, seven hundred eighty-one".