191019040259 has 2 divisors, whose sum is σ = 191019040260. Its totient is φ = 191019040258.

The previous prime is 191019040229. The next prime is 191019040273. The reversal of 191019040259 is 952040910191.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191019040259 - 2¹⁶ = 191018974723 is a prime.

It is not a weakly prime, because it can be changed into another prime (191019040229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95509520129 + 95509520130.

It is an arithmetic number, because the mean of its divisors is an integer number (95509520130).

Almost surely, 2^191019040259 is an apocalyptic number.

191019040259 is a deficient number, since it is larger than the sum of its proper divisors (1).

191019040259 is an equidigital number, since it uses as much as digits as its factorization.

191019040259 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 41.

The spelling of 191019040259 in words is "one hundred ninety-one billion, nineteen million, forty thousand, two hundred fifty-nine".