191219983 has 2 divisors, whose sum is σ = 191219984. Its totient is φ = 191219982.

The previous prime is 191219929. The next prime is 191219993. The reversal of 191219983 is 389912191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191219983 - 2²⁵ = 157665551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191219993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95609991 + 95609992.

It is an arithmetic number, because the mean of its divisors is an integer number (95609992).

Almost surely, 2^191219983 is an apocalyptic number.

191219983 is a deficient number, since it is larger than the sum of its proper divisors (1).

191219983 is an equidigital number, since it uses as much as digits as its factorization.

191219983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 43.

The square root of 191219983 is about 13828.2313764270. The cubic root of 191219983 is about 576.1175322387.

The spelling of 191219983 in words is "one hundred ninety-one million, two hundred nineteen thousand, nine hundred eighty-three".