1131202111 has 4 divisors (see below), whose sum is σ = 1218217672. Its totient is φ = 1044186552.

The previous prime is 1131202003. The next prime is 1131202129. The reversal of 1131202111 is 1112021311.

It is a happy number.

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 1131202111 - 2⁷ = 1131201983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 87015547 = 1131202111 / (1 + 1 + 3 + 1 + 2 + 0 + 2 + 1 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1131202091 and 1131202100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131202141) 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, 43507761 + ... + 43507786.

It is an arithmetic number, because the mean of its divisors is an integer number (304554418).

Almost surely, 2^1131202111 is an apocalyptic number.

1131202111 is a deficient number, since it is larger than the sum of its proper divisors (87015561).

1131202111 is an equidigital number, since it uses as much as digits as its factorization.

1131202111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87015560.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1131202111 is about 33633.3481978824. The cubic root of 1131202111 is about 1041.9496560570.

Adding to 1131202111 its reverse (1112021311), we get a palindrome (2243223422).

The spelling of 1131202111 in words is "one billion, one hundred thirty-one million, two hundred two thousand, one hundred eleven".