19803481 has 2 divisors, whose sum is σ = 19803482. Its totient is φ = 19803480.

The previous prime is 19803449. The next prime is 19803523. The reversal of 19803481 is 18430891.

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., 19009600 + 793881 = 4360^2 + 891^2 .

It is an emirp because it is prime and its reverse (18430891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19803481 - 2⁵ = 19803449 is a prime.

It is a super-2 number, since 2×19803481² = 784355719434722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19803431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9901740 + 9901741.

It is an arithmetic number, because the mean of its divisors is an integer number (9901741).

Almost surely, 2^19803481 is an apocalyptic number.

It is an amenable number.

19803481 is a deficient number, since it is larger than the sum of its proper divisors (1).

19803481 is an equidigital number, since it uses as much as digits as its factorization.

19803481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 19803481 is about 4450.1102233540. The cubic root of 19803481 is about 270.5497759871.

The spelling of 19803481 in words is "nineteen million, eight hundred three thousand, four hundred eighty-one".