191333983 has 2 divisors, whose sum is σ = 191333984. Its totient is φ = 191333982.

The previous prime is 191333959. The next prime is 191334001. The reversal of 191333983 is 389333191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191333983 - 2⁵ = 191333951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191333903) 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, 95666991 + 95666992.

It is an arithmetic number, because the mean of its divisors is an integer number (95666992).

Almost surely, 2^191333983 is an apocalyptic number.

191333983 is a deficient number, since it is larger than the sum of its proper divisors (1).

191333983 is an equidigital number, since it uses as much as digits as its factorization.

191333983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52488, while the sum is 40.

The square root of 191333983 is about 13832.3527644432. The cubic root of 191333983 is about 576.2319978754.

The spelling of 191333983 in words is "one hundred ninety-one million, three hundred thirty-three thousand, nine hundred eighty-three".