199721383 has 2 divisors, whose sum is σ = 199721384. Its totient is φ = 199721382.

The previous prime is 199721371. The next prime is 199721387. The reversal of 199721383 is 383127991.

It is a strong prime.

It is an emirp because it is prime and its reverse (383127991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199721383 - 2¹⁷ = 199590311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199721387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99860691 + 99860692.

It is an arithmetic number, because the mean of its divisors is an integer number (99860692).

Almost surely, 2^199721383 is an apocalyptic number.

199721383 is a deficient number, since it is larger than the sum of its proper divisors (1).

199721383 is an equidigital number, since it uses as much as digits as its factorization.

199721383 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 43.

The square root of 199721383 is about 14132.2815921563. The cubic root of 199721383 is about 584.5318610926.

The spelling of 199721383 in words is "one hundred ninety-nine million, seven hundred twenty-one thousand, three hundred eighty-three".