1125820911 has 4 divisors (see below), whose sum is σ = 1501094552. Its totient is φ = 750547272.

The previous prime is 1125820907. The next prime is 1125820987. The reversal of 1125820911 is 1190285211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1190285211 = 3 ⋅396761737.

It is not a de Polignac number, because 1125820911 - 2² = 1125820907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125820901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187636816 + ... + 187636821.

It is an arithmetic number, because the mean of its divisors is an integer number (375273638).

Almost surely, 2^1125820911 is an apocalyptic number.

1125820911 is a deficient number, since it is larger than the sum of its proper divisors (375273641).

1125820911 is an equidigital number, since it uses as much as digits as its factorization.

1125820911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375273640.

The product of its (nonzero) digits is 1440, while the sum is 30.

The square root of 1125820911 is about 33553.2548495671. The cubic root of 1125820911 is about 1040.2948224184.

The spelling of 1125820911 in words is "one billion, one hundred twenty-five million, eight hundred twenty thousand, nine hundred eleven".