1125172025809 has 16 divisors (see below), whose sum is σ = 1228383878400. Its totient is φ = 1024368523776.

The previous prime is 1125172025807. The next prime is 1125172025819. The reversal of 1125172025809 is 9085202715211.

It is not a de Polignac number, because 1125172025809 - 2¹ = 1125172025807 is a prime.

It is a super-3 number, since 3×1125172025809³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1125172025807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364422 + ... + 1543744.

It is an arithmetic number, because the mean of its divisors is an integer number (76773992400).

Almost surely, 2^{1125172025809} is an apocalyptic number.

It is an amenable number.

1125172025809 is a deficient number, since it is larger than the sum of its proper divisors (103211852591).

1125172025809 is a wasteful number, since it uses less digits than its factorization.

1125172025809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180344.

The product of its (nonzero) digits is 100800, while the sum is 43.

The spelling of 1125172025809 in words is "one trillion, one hundred twenty-five billion, one hundred seventy-two million, twenty-five thousand, eight hundred nine".