19671361 has 2 divisors, whose sum is σ = 19671362. Its totient is φ = 19671360.

The previous prime is 19671359. The next prime is 19671389. The reversal of 19671361 is 16317691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18870336 + 801025 = 4344^2 + 895^2 .

It is a cyclic number.

It is not a de Polignac number, because 19671361 - 2¹ = 19671359 is a prime.

Together with 19671359, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19671461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9835680 + 9835681.

It is an arithmetic number, because the mean of its divisors is an integer number (9835681).

Almost surely, 2^19671361 is an apocalyptic number.

19671361 is the 1984-th centered decagonal number.

It is an amenable number.

19671361 is a deficient number, since it is larger than the sum of its proper divisors (1).

19671361 is an equidigital number, since it uses as much as digits as its factorization.

19671361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 34.

The square root of 19671361 is about 4435.2408051875. The cubic root of 19671361 is about 269.9467704852.

The spelling of 19671361 in words is "nineteen million, six hundred seventy-one thousand, three hundred sixty-one".