19969249 has 2 divisors, whose sum is σ = 19969250. Its totient is φ = 19969248.

The previous prime is 19969211. The next prime is 19969259. The reversal of 19969249 is 94296991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19421649 + 547600 = 4407^2 + 740^2 .

It is a cyclic number.

It is not a de Polignac number, because 19969249 - 2⁹ = 19968737 is a prime.

It is not a weakly prime, because it can be changed into another prime (19969259) 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, 9984624 + 9984625.

It is an arithmetic number, because the mean of its divisors is an integer number (9984625).

Almost surely, 2^19969249 is an apocalyptic number.

It is an amenable number.

19969249 is a deficient number, since it is larger than the sum of its proper divisors (1).

19969249 is an equidigital number, since it uses as much as digits as its factorization.

19969249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 49.

The square root of 19969249 is about 4468.6965661141. The cubic root of 19969249 is about 271.3025718711.

It can be divided in two parts, 19969 and 249, that multiplied together give a triangular number (4972281 = T₃₁₅₃).

The spelling of 19969249 in words is "nineteen million, nine hundred sixty-nine thousand, two hundred forty-nine".