19678541 has 2 divisors, whose sum is σ = 19678542. Its totient is φ = 19678540.

The previous prime is 19678531. The next prime is 19678567. The reversal of 19678541 is 14587691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19616041 + 62500 = 4429^2 + 250^2 .

It is a cyclic number.

It is not a de Polignac number, because 19678541 - 2¹⁴ = 19662157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19678531) 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, 9839270 + 9839271.

It is an arithmetic number, because the mean of its divisors is an integer number (9839271).

Almost surely, 2^19678541 is an apocalyptic number.

It is an amenable number.

19678541 is a deficient number, since it is larger than the sum of its proper divisors (1).

19678541 is an equidigital number, since it uses as much as digits as its factorization.

19678541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 41.

The square root of 19678541 is about 4436.0501575163. The cubic root of 19678541 is about 269.9796097999.

The spelling of 19678541 in words is "nineteen million, six hundred seventy-eight thousand, five hundred forty-one".