265091191 has 2 divisors, whose sum is σ = 265091192. Its totient is φ = 265091190.

The previous prime is 265091179. The next prime is 265091297. The reversal of 265091191 is 191190562.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 265091191 - 2⁵ = 265091159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265097191) 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, 132545595 + 132545596.

It is an arithmetic number, because the mean of its divisors is an integer number (132545596).

Almost surely, 2^265091191 is an apocalyptic number.

265091191 is a deficient number, since it is larger than the sum of its proper divisors (1).

265091191 is an equidigital number, since it uses as much as digits as its factorization.

265091191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 34.

The square root of 265091191 is about 16281.6212644810. The cubic root of 265091191 is about 642.3894976680.

The spelling of 265091191 in words is "two hundred sixty-five million, ninety-one thousand, one hundred ninety-one".