19009515625 has 21 divisors (see below), whose sum is σ = 23783152603.
Its totient is φ = 15193825000.
The previous prime is 19009515619. The next prime is 19009515683. The reversal of 19009515625 is 52651590091.
The square root of 19009515625 is 137875.
It is a perfect power (a square), and thus also a powerful number.
It can be written as a sum of positive squares in 3 ways, for example, as 16654160601 + 2355355024 = 129051^2 + 48532^2
It is not a de Polignac number, because 19009515625 - 223 = 19001127017 is a prime.
It is a super-2 number, since 2×190095156252 (a number of 21 digits) contains 22 as substring.
It is a Duffinian number.
It is an unprimeable number.
It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 17233824 + ... + 17234926.
Almost surely, 219009515625 is an apocalyptic number.
19009515625 is the 137875-th square number.
19009515625 is the 68938-th centered octagonal number.
It is an amenable number.
19009515625 is a deficient number, since it is larger than the sum of its proper divisors (4773636978).
19009515625 is an frugal number, since it uses more digits than its factorization.
19009515625 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2236 (or 1108 counting only the distinct ones).
The product of its (nonzero) digits is 121500, while the sum is 43.
The spelling of 19009515625 in words is "nineteen billion, nine million, five hundred fifteen thousand, six hundred twenty-five".