19842541 has 2 divisors, whose sum is σ = 19842542. Its totient is φ = 19842540.

The previous prime is 19842539. The next prime is 19842551. The reversal of 19842541 is 14524891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19766916 + 75625 = 4446^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 19842541 - 2¹ = 19842539 is a prime.

Together with 19842539, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 19842497 and 19842506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19842521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9921270 + 9921271.

It is an arithmetic number, because the mean of its divisors is an integer number (9921271).

Almost surely, 2^19842541 is an apocalyptic number.

It is an amenable number.

19842541 is a deficient number, since it is larger than the sum of its proper divisors (1).

19842541 is an equidigital number, since it uses as much as digits as its factorization.

19842541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 34.

The square root of 19842541 is about 4454.4967168020. The cubic root of 19842541 is about 270.7275348708.

The spelling of 19842541 in words is "nineteen million, eight hundred forty-two thousand, five hundred forty-one".