19108915225 has 9 divisors (see below), whose sum is σ = 23695911967. Its totient is φ = 15286579240.

The previous prime is 19108915213. The next prime is 19108915249. The reversal of 19108915225 is 52251980191.

The square root of 19108915225 is 138235.

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., 6879209481 + 12229705744 = 82941^2 + 110588^2 .

It is not a de Polignac number, because 19108915225 - 2⁷ = 19108915097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 677352 + ... + 704998.

Almost surely, 2^19108915225 is an apocalyptic number.

19108915225 is the 138235-th square number.

19108915225 is the 69118-th centered octagonal number.

It is an amenable number.

19108915225 is a deficient number, since it is larger than the sum of its proper divisors (4586996742).

19108915225 is an frugal number, since it uses more digits than its factorization.

19108915225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55304 (or 27652 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 43.

The spelling of 19108915225 in words is "nineteen billion, one hundred eight million, nine hundred fifteen thousand, two hundred twenty-five".