255834991 has 2 divisors, whose sum is σ = 255834992. Its totient is φ = 255834990.

The previous prime is 255834979. The next prime is 255835031. The reversal of 255834991 is 199438552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 255834991 - 2¹⁹ = 255310703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255834941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127917495 + 127917496.

It is an arithmetic number, because the mean of its divisors is an integer number (127917496).

Almost surely, 2^255834991 is an apocalyptic number.

255834991 is a deficient number, since it is larger than the sum of its proper divisors (1).

255834991 is an equidigital number, since it uses as much as digits as its factorization.

255834991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 46.

The square root of 255834991 is about 15994.8426375504. The cubic root of 255834991 is about 634.8239667463.

The spelling of 255834991 in words is "two hundred fifty-five million, eight hundred thirty-four thousand, nine hundred ninety-one".