191185949 has 2 divisors, whose sum is σ = 191185950. Its totient is φ = 191185948.

The previous prime is 191185909. The next prime is 191185963. The reversal of 191185949 is 949581191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185449924 + 5736025 = 13618^2 + 2395^2 .

It is a cyclic number.

It is not a de Polignac number, because 191185949 - 2²⁰ = 190137373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191185909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95592974 + 95592975.

It is an arithmetic number, because the mean of its divisors is an integer number (95592975).

Almost surely, 2^191185949 is an apocalyptic number.

It is an amenable number.

191185949 is a deficient number, since it is larger than the sum of its proper divisors (1).

191185949 is an equidigital number, since it uses as much as digits as its factorization.

191185949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 47.

The square root of 191185949 is about 13827.0007232227. Note that the first 3 decimals coincide. The cubic root of 191185949 is about 576.0833504076.

The spelling of 191185949 in words is "one hundred ninety-one million, one hundred eighty-five thousand, nine hundred forty-nine".