19842241 has 2 divisors, whose sum is σ = 19842242. Its totient is φ = 19842240.

The previous prime is 19842239. The next prime is 19842259. The reversal of 19842241 is 14224891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15241216 + 4601025 = 3904^2 + 2145^2 .

It is a cyclic number.

It is not a de Polignac number, because 19842241 - 2¹ = 19842239 is a prime.

Together with 19842239, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19842271) 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, 9921120 + 9921121.

It is an arithmetic number, because the mean of its divisors is an integer number (9921121).

Almost surely, 2^19842241 is an apocalyptic number.

It is an amenable number.

19842241 is a deficient number, since it is larger than the sum of its proper divisors (1).

19842241 is an equidigital number, since it uses as much as digits as its factorization.

19842241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 31.

The square root of 19842241 is about 4454.4630428369. The cubic root of 19842241 is about 270.7261704846.

It can be divided in two parts, 1984 and 2241, that added together give a square (4225 = 65²).

The spelling of 19842241 in words is "nineteen million, eight hundred forty-two thousand, two hundred forty-one".