19516841 has 2 divisors, whose sum is σ = 19516842. Its totient is φ = 19516840.

The previous prime is 19516829. The next prime is 19516843. The reversal of 19516841 is 14861591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12988816 + 6528025 = 3604^2 + 2555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19516841 is a prime.

Together with 19516843, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19516843) 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, 9758420 + 9758421.

It is an arithmetic number, because the mean of its divisors is an integer number (9758421).

Almost surely, 2^19516841 is an apocalyptic number.

It is an amenable number.

19516841 is a deficient number, since it is larger than the sum of its proper divisors (1).

19516841 is an equidigital number, since it uses as much as digits as its factorization.

19516841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 35.

The square root of 19516841 is about 4417.7868893825. The cubic root of 19516841 is about 269.2380943627.

The spelling of 19516841 in words is "nineteen million, five hundred sixteen thousand, eight hundred forty-one".