191318311 has 2 divisors, whose sum is σ = 191318312. Its totient is φ = 191318310.

The previous prime is 191318291. The next prime is 191318321. The reversal of 191318311 is 113813191.

It is a strong prime.

It is an emirp because it is prime and its reverse (113813191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191318311 - 2⁹ = 191317799 is a prime.

It is a super-2 number, since 2×191318311² = 73205392247785442, which contains 22 as substring.

It is a Chen prime.

It is equal to p_10624474 and since 191318311 and 10624474 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191318311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191318321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95659155 + 95659156.

It is an arithmetic number, because the mean of its divisors is an integer number (95659156).

Almost surely, 2^191318311 is an apocalyptic number.

191318311 is a deficient number, since it is larger than the sum of its proper divisors (1).

191318311 is an equidigital number, since it uses as much as digits as its factorization.

191318311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 28.

The square root of 191318311 is about 13831.7862548552. The cubic root of 191318311 is about 576.2162645587.

The spelling of 191318311 in words is "one hundred ninety-one million, three hundred eighteen thousand, three hundred eleven".