19488997609 has 9 divisors (see below), whose sum is σ = 19651576567. Its totient is φ = 19327756144.

The previous prime is 19488997603. The next prime is 19488997631. The reversal of 19488997609 is 90679988491.

The square root of 19488997609 is 139603.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 11447930025 + 8041067584 = 106995^2 + 89672^2 .

It is not a de Polignac number, because 19488997609 - 2³ = 19488997601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19488997601) 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 in 8 ways as a sum of consecutive naturals, for example, 19125102 + ... + 19126120.

Almost surely, 2^19488997609 is an apocalyptic number.

19488997609 is the 139603-rd square number.

19488997609 is the 69802-nd centered octagonal number.

It is an amenable number.

19488997609 is a deficient number, since it is larger than the sum of its proper divisors (162578958).

19488997609 is an frugal number, since it uses more digits than its factorization.

19488997609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2312 (or 1156 counting only the distinct ones).

The product of its (nonzero) digits is 70543872, while the sum is 70.

The spelling of 19488997609 in words is "nineteen billion, four hundred eighty-eight million, nine hundred ninety-seven thousand, six hundred nine".