19438081225 has 12 divisors (see below), whose sum is σ = 24192832140. Its totient is φ = 15492651200.

The previous prime is 19438081213. The next prime is 19438081237. The reversal of 19438081225 is 52218083491.

It is an interprime number because it is at equal distance from previous prime (19438081213) and next prime (19438081237).

It can be written as a sum of positive squares in 6 ways, for example, as 6762924169 + 12675157056 = 82237^2 + 112584^2 .

It is not a de Polignac number, because 19438081225 - 2¹⁹ = 19437556937 is a prime.

It is a super-3 number, since 3×19438081225³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1438486 + ... + 1451935.

It is an arithmetic number, because the mean of its divisors is an integer number (2016069345).

Almost surely, 2^19438081225 is an apocalyptic number.

It is an amenable number.

19438081225 is a deficient number, since it is larger than the sum of its proper divisors (4754750915).

19438081225 is a wasteful number, since it uses less digits than its factorization.

19438081225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2890700 (or 2890695 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 19438081225 in words is "nineteen billion, four hundred thirty-eight million, eighty-one thousand, two hundred twenty-five".