19975309 has 2 divisors, whose sum is σ = 19975310. Its totient is φ = 19975308.

The previous prime is 19975303. The next prime is 19975321. The reversal of 19975309 is 90357991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16281225 + 3694084 = 4035^2 + 1922^2 .

It is a cyclic number.

It is not a de Polignac number, because 19975309 - 2⁹ = 19974797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19975303) 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, 9987654 + 9987655.

It is an arithmetic number, because the mean of its divisors is an integer number (9987655).

Almost surely, 2^19975309 is an apocalyptic number.

It is an amenable number.

19975309 is a deficient number, since it is larger than the sum of its proper divisors (1).

19975309 is an equidigital number, since it uses as much as digits as its factorization.

19975309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76545, while the sum is 43.

The square root of 19975309 is about 4469.3745647462. The cubic root of 19975309 is about 271.3300128514.

The spelling of 19975309 in words is "nineteen million, nine hundred seventy-five thousand, three hundred nine".