255347681 has 2 divisors, whose sum is σ = 255347682. Its totient is φ = 255347680.

The previous prime is 255347627. The next prime is 255347683. The reversal of 255347681 is 186743552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221533456 + 33814225 = 14884^2 + 5815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255347681 is a prime.

It is a super-2 number, since 2×255347681² = 130404876384155522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 255347683, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (255347683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127673840 + 127673841.

It is an arithmetic number, because the mean of its divisors is an integer number (127673841).

Almost surely, 2^255347681 is an apocalyptic number.

It is an amenable number.

255347681 is a deficient number, since it is larger than the sum of its proper divisors (1).

255347681 is an equidigital number, since it uses as much as digits as its factorization.

255347681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 41.

The square root of 255347681 is about 15979.6020288366. The cubic root of 255347681 is about 634.4206433740.

The spelling of 255347681 in words is "two hundred fifty-five million, three hundred forty-seven thousand, six hundred eighty-one".