19849121 has 2 divisors, whose sum is σ = 19849122. Its totient is φ = 19849120.

The previous prime is 19849117. The next prime is 19849127. The reversal of 19849121 is 12194891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19704721 + 144400 = 4439^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 19849121 - 2² = 19849117 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19849127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9924560 + 9924561.

It is an arithmetic number, because the mean of its divisors is an integer number (9924561).

Almost surely, 2^19849121 is an apocalyptic number.

It is an amenable number.

19849121 is a deficient number, since it is larger than the sum of its proper divisors (1).

19849121 is an equidigital number, since it uses as much as digits as its factorization.

19849121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 35.

The square root of 19849121 is about 4455.2352350914. The cubic root of 19849121 is about 270.7574569510.

The spelling of 19849121 in words is "nineteen million, eight hundred forty-nine thousand, one hundred twenty-one".