1131123121 has 2 divisors, whose sum is σ = 1131123122. Its totient is φ = 1131123120.

The previous prime is 1131123089. The next prime is 1131123131. The reversal of 1131123121 is 1213211311.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1121513121 + 9610000 = 33489^2 + 3100^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131123121 - 2⁵ = 1131123089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1131123095 and 1131123104.

It is not a weakly prime, because it can be changed into another prime (1131123131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565561560 + 565561561.

It is an arithmetic number, because the mean of its divisors is an integer number (565561561).

Almost surely, 2^1131123121 is an apocalyptic number.

It is an amenable number.

1131123121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131123121 is an equidigital number, since it uses as much as digits as its factorization.

1131123121 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1131123121 is about 33632.1738964343. The cubic root of 1131123121 is about 1041.9254029436.

Adding to 1131123121 its reverse (1213211311), we get a palindrome (2344334432).

The spelling of 1131123121 in words is "one billion, one hundred thirty-one million, one hundred twenty-three thousand, one hundred twenty-one".