255716191 has 2 divisors, whose sum is σ = 255716192. Its totient is φ = 255716190.

The previous prime is 255716161. The next prime is 255716233. The reversal of 255716191 is 191617552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 255716191 - 2²⁵ = 222161759 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 255716191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255716101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127858095 + 127858096.

It is an arithmetic number, because the mean of its divisors is an integer number (127858096).

Almost surely, 2^255716191 is an apocalyptic number.

255716191 is a deficient number, since it is larger than the sum of its proper divisors (1).

255716191 is an equidigital number, since it uses as much as digits as its factorization.

255716191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18900, while the sum is 37.

The square root of 255716191 is about 15991.1285092704. The cubic root of 255716191 is about 634.7256888634.

The spelling of 255716191 in words is "two hundred fifty-five million, seven hundred sixteen thousand, one hundred ninety-one".