19070781409 has 9 divisors (see below), whose sum is σ = 19195461721. Its totient is φ = 18946908400.

The previous prime is 19070781347. The next prime is 19070781439. The reversal of 19070781409 is 90418707091.

The square root of 19070781409 is 138097.

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

It can be written as a sum of positive squares in 4 ways, for example, as 14319712225 + 4751069184 = 119665^2 + 68928^2 .

It is not a de Polignac number, because 19070781409 - 2⁷ = 19070781281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19070781439) 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, 27204759 + ... + 27205459.

Almost surely, 2^19070781409 is an apocalyptic number.

19070781409 is the 138097-th square number.

19070781409 is the 69049-th centered octagonal number.

It is an amenable number.

19070781409 is a deficient number, since it is larger than the sum of its proper divisors (124680312).

19070781409 is an frugal number, since it uses more digits than its factorization.

19070781409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1796 (or 898 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 46.

The spelling of 19070781409 in words is "nineteen billion, seventy million, seven hundred eighty-one thousand, four hundred nine".