1125213511 has 16 divisors (see below), whose sum is σ = 1170892800. Its totient is φ = 1080619488.

The previous prime is 1125213499. The next prime is 1125213517. The reversal of 1125213511 is 1153125211.

It is not a de Polignac number, because 1125213511 - 2¹¹ = 1125211463 is a prime.

It is a super-2 number, since 2×1125213511² = 2532210890673894242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125213517) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 663781 + ... + 665473.

It is an arithmetic number, because the mean of its divisors is an integer number (73180800).

Almost surely, 2^1125213511 is an apocalyptic number.

1125213511 is a deficient number, since it is larger than the sum of its proper divisors (45679289).

1125213511 is a wasteful number, since it uses less digits than its factorization.

1125213511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1998.

The product of its digits is 300, while the sum is 22.

The square root of 1125213511 is about 33544.2023455619. The cubic root of 1125213511 is about 1040.1077030347.

Adding to 1125213511 its reverse (1153125211), we get a palindrome (2278338722).

The spelling of 1125213511 in words is "one billion, one hundred twenty-five million, two hundred thirteen thousand, five hundred eleven".