191136929 has 2 divisors, whose sum is σ = 191136930. Its totient is φ = 191136928.

The previous prime is 191136919. The next prime is 191136961. The reversal of 191136929 is 929631191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183656704 + 7480225 = 13552^2 + 2735^2 .

It is an emirp because it is prime and its reverse (929631191) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191136929 is a prime.

It is not a weakly prime, because it can be changed into another prime (191136919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95568464 + 95568465.

It is an arithmetic number, because the mean of its divisors is an integer number (95568465).

Almost surely, 2^191136929 is an apocalyptic number.

It is an amenable number.

191136929 is a deficient number, since it is larger than the sum of its proper divisors (1).

191136929 is an equidigital number, since it uses as much as digits as its factorization.

191136929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 41.

The square root of 191136929 is about 13825.2279908868. The cubic root of 191136929 is about 576.0341103530.

The spelling of 191136929 in words is "one hundred ninety-one million, one hundred thirty-six thousand, nine hundred twenty-nine".