19913443225 has 45 divisors (see below), whose sum is σ = 26911460747. Its totient is φ = 14617256160.

The previous prime is 19913443139. The next prime is 19913443267. The reversal of 19913443225 is 52234431991.

The square root of 19913443225 is 141115.

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

It can be written as a sum of positive squares in 7 ways, for example, as 19538168841 + 375274384 = 139779^2 + 19372^2 .

It is not a de Polignac number, because 19913443225 - 2¹³ = 19913435033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 119242092 + ... + 119242258.

Almost surely, 2^19913443225 is an apocalyptic number.

19913443225 is the 141115-th square number.

19913443225 is the 70558-th centered octagonal number.

It is an amenable number.

19913443225 is a deficient number, since it is larger than the sum of its proper divisors (6998017522).

19913443225 is an frugal number, since it uses more digits than its factorization.

19913443225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396 (or 185 counting only the distinct ones).

The product of its digits is 233280, while the sum is 43.

The spelling of 19913443225 in words is "nineteen billion, nine hundred thirteen million, four hundred forty-three thousand, two hundred twenty-five".