199442381 has 2 divisors, whose sum is σ = 199442382. Its totient is φ = 199442380.

The previous prime is 199442371. The next prime is 199442413. The reversal of 199442381 is 183244991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157904356 + 41538025 = 12566^2 + 6445^2 .

It is a cyclic number.

It is not a de Polignac number, because 199442381 - 2¹⁰ = 199441357 is a prime.

It is a super-2 number, since 2×199442381² = 79554526677898322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199442371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99721190 + 99721191.

It is an arithmetic number, because the mean of its divisors is an integer number (99721191).

Almost surely, 2^199442381 is an apocalyptic number.

It is an amenable number.

199442381 is a deficient number, since it is larger than the sum of its proper divisors (1).

199442381 is an equidigital number, since it uses as much as digits as its factorization.

199442381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 41.

The square root of 199442381 is about 14122.4070540400. The cubic root of 199442381 is about 584.2595458036.

The spelling of 199442381 in words is "one hundred ninety-nine million, four hundred forty-two thousand, three hundred eighty-one".