1131263273 has 4 divisors (see below), whose sum is σ = 1292872320. Its totient is φ = 969654228.

The previous prime is 1131263269. The next prime is 1131263293. The reversal of 1131263273 is 3723621311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3723621311 = 19 ⋅195980069.

It is a cyclic number.

It is not a de Polignac number, because 1131263273 - 2² = 1131263269 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131263293) 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, 80804513 + ... + 80804526.

It is an arithmetic number, because the mean of its divisors is an integer number (323218080).

Almost surely, 2^1131263273 is an apocalyptic number.

It is an amenable number.

1131263273 is a deficient number, since it is larger than the sum of its proper divisors (161609047).

1131263273 is an equidigital number, since it uses as much as digits as its factorization.

1131263273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161609046.

The product of its digits is 4536, while the sum is 29.

The square root of 1131263273 is about 33634.2574319696. The cubic root of 1131263273 is about 1041.9684344803.

Adding to 1131263273 its reverse (3723621311), we get a palindrome (4854884584).

The spelling of 1131263273 in words is "one billion, one hundred thirty-one million, two hundred sixty-three thousand, two hundred seventy-three".