255748681 has 2 divisors, whose sum is σ = 255748682. Its totient is φ = 255748680.

The previous prime is 255748679. The next prime is 255748733. The reversal of 255748681 is 186847552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146023056 + 109725625 = 12084^2 + 10475^2 .

It is a cyclic number.

It is not a de Polignac number, because 255748681 - 2¹ = 255748679 is a prime.

It is a super-2 number, since 2×255748681² = 130814775666479522, which contains 22 as substring.

Together with 255748679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (255748601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127874340 + 127874341.

It is an arithmetic number, because the mean of its divisors is an integer number (127874341).

Almost surely, 2^255748681 is an apocalyptic number.

It is an amenable number.

255748681 is a deficient number, since it is larger than the sum of its proper divisors (1).

255748681 is an equidigital number, since it uses as much as digits as its factorization.

255748681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 537600, while the sum is 46.

The square root of 255748681 is about 15992.1443527752. The cubic root of 255748681 is about 634.7525693987.

The spelling of 255748681 in words is "two hundred fifty-five million, seven hundred forty-eight thousand, six hundred eighty-one".