1125811771 has 4 divisors (see below), whose sum is σ = 1286642032. Its totient is φ = 964981512.

The previous prime is 1125811763. The next prime is 1125811781. The reversal of 1125811771 is 1771185211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1125811771 - 2³ = 1125811763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1125811781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80415120 + ... + 80415133.

It is an arithmetic number, because the mean of its divisors is an integer number (321660508).

Almost surely, 2^1125811771 is an apocalyptic number.

1125811771 is a deficient number, since it is larger than the sum of its proper divisors (160830261).

1125811771 is an equidigital number, since it uses as much as digits as its factorization.

1125811771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160830260.

The product of its digits is 3920, while the sum is 34.

The square root of 1125811771 is about 33553.1186478992. The cubic root of 1125811771 is about 1040.2920071925.

Adding to 1125811771 its reverse (1771185211), we get a palindrome (2896996982).

The spelling of 1125811771 in words is "one billion, one hundred twenty-five million, eight hundred eleven thousand, seven hundred seventy-one".