1131321121 has 4 divisors (see below), whose sum is σ = 1292938432. Its totient is φ = 969703812.

The previous prime is 1131321071. The next prime is 1131321127. The reversal of 1131321121 is 1211231311.

It is a happy number.

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.

It is not a de Polignac number, because 1131321121 - 2⁹ = 1131320609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1131321095 and 1131321104.

It is not an unprimeable number, because it can be changed into a prime (1131321127) 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, 80808645 + ... + 80808658.

It is an arithmetic number, because the mean of its divisors is an integer number (323234608).

Almost surely, 2^1131321121 is an apocalyptic number.

It is an amenable number.

1131321121 is a deficient number, since it is larger than the sum of its proper divisors (161617311).

1131321121 is an equidigital number, since it uses as much as digits as its factorization.

1131321121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161617310.

The product of its digits is 36, while the sum is 16.

The square root of 1131321121 is about 33635.1173775267. The cubic root of 1131321121 is about 1041.9861947913.

Adding to 1131321121 its reverse (1211231311), we get a palindrome (2342552432).

The spelling of 1131321121 in words is "one billion, one hundred thirty-one million, three hundred twenty-one thousand, one hundred twenty-one".