191383873 has 2 divisors, whose sum is σ = 191383874. Its totient is φ = 191383872.

The previous prime is 191383861. The next prime is 191383877. The reversal of 191383873 is 378383191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162996289 + 28387584 = 12767^2 + 5328^2 .

It is a cyclic number.

It is not a de Polignac number, because 191383873 - 2¹⁷ = 191252801 is a prime.

It is not a weakly prime, because it can be changed into another prime (191383877) 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, 95691936 + 95691937.

It is an arithmetic number, because the mean of its divisors is an integer number (95691937).

Almost surely, 2^191383873 is an apocalyptic number.

It is an amenable number.

191383873 is a deficient number, since it is larger than the sum of its proper divisors (1).

191383873 is an equidigital number, since it uses as much as digits as its factorization.

191383873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 191383873 is about 13834.1560277452. The cubic root of 191383873 is about 576.2820773501.

The spelling of 191383873 in words is "one hundred ninety-one million, three hundred eighty-three thousand, eight hundred seventy-three".