1131020211 has 4 divisors (see below), whose sum is σ = 1508026952. Its totient is φ = 754013472.

The previous prime is 1131020203. The next prime is 1131020221. The reversal of 1131020211 is 1120201311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1120201311 = 3 ⋅373400437.

It is not a de Polignac number, because 1131020211 - 2³ = 1131020203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131020221) 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, 188503366 + ... + 188503371.

It is an arithmetic number, because the mean of its divisors is an integer number (377006738).

Almost surely, 2^1131020211 is an apocalyptic number.

1131020211 is a deficient number, since it is larger than the sum of its proper divisors (377006741).

1131020211 is an equidigital number, since it uses as much as digits as its factorization.

1131020211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377006740.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1131020211 is about 33630.6439278227. The cubic root of 1131020211 is about 1041.8938037324.

Adding to 1131020211 its reverse (1120201311), we get a palindrome (2251221522).

The spelling of 1131020211 in words is "one billion, one hundred thirty-one million, twenty thousand, two hundred eleven".