19281266449 has 9 divisors (see below), whose sum is σ = 19409441961. Its totient is φ = 19153934580.

The previous prime is 19281266441. The next prime is 19281266461. The reversal of 19281266449 is 94466218291.

The square root of 19281266449 is 138857.

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

It is not a de Polignac number, because 19281266449 - 2³ = 19281266441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19281266396 and 19281266405.

It is not an unprimeable number, because it can be changed into a prime (19281266441) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 26521324 + ... + 26522050.

Almost surely, 2^19281266449 is an apocalyptic number.

19281266449 is the 138857-th square number.

19281266449 is the 69429-th centered octagonal number.

It is an amenable number.

19281266449 is a deficient number, since it is larger than the sum of its proper divisors (128175512).

19281266449 is an frugal number, since it uses more digits than its factorization.

19281266449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1836 (or 918 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 52.

The spelling of 19281266449 in words is "nineteen billion, two hundred eighty-one million, two hundred sixty-six thousand, four hundred forty-nine".