1125591265 has 8 divisors (see below), whose sum is σ = 1352150568. Its totient is φ = 899512320.

The previous prime is 1125591241. The next prime is 1125591317. The reversal of 1125591265 is 5621955211.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 475545249 + 650046016 = 21807^2 + 25496^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1125591265 - 2¹¹ = 1125589217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114912 + ... + 124321.

It is an arithmetic number, because the mean of its divisors is an integer number (169018821).

Almost surely, 2^1125591265 is an apocalyptic number.

It is an amenable number.

1125591265 is a deficient number, since it is larger than the sum of its proper divisors (226559303).

1125591265 is an equidigital number, since it uses as much as digits as its factorization.

1125591265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240179.

The product of its digits is 27000, while the sum is 37.

The square root of 1125591265 is about 33549.8325629205. The cubic root of 1125591265 is about 1040.2240841722.

The spelling of 1125591265 in words is "one billion, one hundred twenty-five million, five hundred ninety-one thousand, two hundred sixty-five".