1131205223 has 4 divisors (see below), whose sum is σ = 1190742360. Its totient is φ = 1071668088.

The previous prime is 1131205217. The next prime is 1131205237. The reversal of 1131205223 is 3225021311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3225021311 = 977 ⋅3300943.

It is a cyclic number.

It is not a de Polignac number, because 1131205223 - 2⁸ = 1131204967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1131205195 and 1131205204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131207223) 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, 29768540 + ... + 29768577.

It is an arithmetic number, because the mean of its divisors is an integer number (297685590).

Almost surely, 2^1131205223 is an apocalyptic number.

1131205223 is a deficient number, since it is larger than the sum of its proper divisors (59537137).

1131205223 is an equidigital number, since it uses as much as digits as its factorization.

1131205223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59537136.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1131205223 is about 33633.3944614575. The cubic root of 1131205223 is about 1041.9506115433.

Adding to 1131205223 its reverse (3225021311), we get a palindrome (4356226534).

The spelling of 1131205223 in words is "one billion, one hundred thirty-one million, two hundred five thousand, two hundred twenty-three".