1125290275209 has 27 divisors (see below), whose sum is σ = 1641831517287. Its totient is φ = 742693682016.

The previous prime is 1125290275201. The next prime is 1125290275229. The reversal of 1125290275209 is 9025720925211.

The square root of 1125290275209 is 1060797.

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

1125290275209 is a `hidden beast` number, since 1 + 12 + 5 + 2 + 90 + 27 + 520 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 372435575625 + 752854699584 = 610275^2 + 867672^2 .

It is not a de Polignac number, because 1125290275209 - 2³ = 1125290275201 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1125290275201) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 327784557 + ... + 327787989.

Almost surely, 2^{1125290275209} is an apocalyptic number.

1125290275209 is the 1060797-th square number.

1125290275209 is the 530399-th centered octagonal number.

It is an amenable number.

1125290275209 is a deficient number, since it is larger than the sum of its proper divisors (516541242078).

1125290275209 is an frugal number, since it uses more digits than its factorization.

1125290275209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7078 (or 3539 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The spelling of 1125290275209 in words is "one trillion, one hundred twenty-five billion, two hundred ninety million, two hundred seventy-five thousand, two hundred nine".