255106991 has 2 divisors, whose sum is σ = 255106992. Its totient is φ = 255106990.

The previous prime is 255106987. The next prime is 255107033. The reversal of 255106991 is 199601552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 255106991 - 2² = 255106987 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255106921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127553495 + 127553496.

It is an arithmetic number, because the mean of its divisors is an integer number (127553496).

Almost surely, 2^255106991 is an apocalyptic number.

255106991 is a deficient number, since it is larger than the sum of its proper divisors (1).

255106991 is an equidigital number, since it uses as much as digits as its factorization.

255106991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24300, while the sum is 38.

The square root of 255106991 is about 15972.0690895075. The cubic root of 255106991 is about 634.2212463440.

The spelling of 255106991 in words is "two hundred fifty-five million, one hundred six thousand, nine hundred ninety-one".