191812849 has 2 divisors, whose sum is σ = 191812850. Its totient is φ = 191812848.

The previous prime is 191812813. The next prime is 191812861. The reversal of 191812849 is 948218191.

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., 122257249 + 69555600 = 11057^2 + 8340^2 .

It is a cyclic number.

It is not a de Polignac number, because 191812849 - 2⁹ = 191812337 is a prime.

It is not a weakly prime, because it can be changed into another prime (191812549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95906424 + 95906425.

It is an arithmetic number, because the mean of its divisors is an integer number (95906425).

Almost surely, 2^191812849 is an apocalyptic number.

It is an amenable number.

191812849 is a deficient number, since it is larger than the sum of its proper divisors (1).

191812849 is an equidigital number, since it uses as much as digits as its factorization.

191812849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 43.

The square root of 191812849 is about 13849.6515840652. The cubic root of 191812849 is about 576.7123238192.

The spelling of 191812849 in words is "one hundred ninety-one million, eight hundred twelve thousand, eight hundred forty-nine".