191111113 has 2 divisors, whose sum is σ = 191111114. Its totient is φ = 191111112.

The previous prime is 191111087. The next prime is 191111119. The reversal of 191111113 is 311111191.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142850304 + 48260809 = 11952^2 + 6947^2 .

It is a cyclic number.

It is not a de Polignac number, because 191111113 - 2¹³ = 191102921 is a prime.

It is not a weakly prime, because it can be changed into another prime (191111119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95555556 + 95555557.

It is an arithmetic number, because the mean of its divisors is an integer number (95555557).

Almost surely, 2^191111113 is an apocalyptic number.

It is an amenable number.

191111113 is a deficient number, since it is larger than the sum of its proper divisors (1).

191111113 is an equidigital number, since it uses as much as digits as its factorization.

191111113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27, while the sum is 19.

The square root of 191111113 is about 13824.2943038695. The cubic root of 191111113 is about 576.0081750785.

The spelling of 191111113 in words is "one hundred ninety-one million, one hundred eleven thousand, one hundred thirteen".