1131201121 has 2 divisors, whose sum is σ = 1131201122. Its totient is φ = 1131201120.

The previous prime is 1131201109. The next prime is 1131201143. The reversal of 1131201121 is 1211021311.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1125267025 + 5934096 = 33545^2 + 2436^2 .

It is an emirp because it is prime and its reverse (1211021311) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131201121 is a prime.

It is not a weakly prime, because it can be changed into another prime (1131201161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565600560 + 565600561.

It is an arithmetic number, because the mean of its divisors is an integer number (565600561).

Almost surely, 2^1131201121 is an apocalyptic number.

It is an amenable number.

1131201121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131201121 is an equidigital number, since it uses as much as digits as its factorization.

1131201121 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1131201121 is about 33633.3334803436. Note that the first 3 decimals coincide. The cubic root of 1131201121 is about 1041.9493520941.

Adding to 1131201121 its reverse (1211021311), we get a palindrome (2342222432).

The spelling of 1131201121 in words is "one billion, one hundred thirty-one million, two hundred one thousand, one hundred twenty-one".