255330391 has 2 divisors, whose sum is σ = 255330392. Its totient is φ = 255330390.

The previous prime is 255330389. The next prime is 255330443. The reversal of 255330391 is 193033552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 255330391 - 2¹ = 255330389 is a prime.

Together with 255330389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255330331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127665195 + 127665196.

It is an arithmetic number, because the mean of its divisors is an integer number (127665196).

Almost surely, 2^255330391 is an apocalyptic number.

255330391 is a deficient number, since it is larger than the sum of its proper divisors (1).

255330391 is an equidigital number, since it uses as much as digits as its factorization.

255330391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12150, while the sum is 31.

The square root of 255330391 is about 15979.0610174691. The cubic root of 255330391 is about 634.4063238385.

The spelling of 255330391 in words is "two hundred fifty-five million, three hundred thirty thousand, three hundred ninety-one".