1131131021 has 2 divisors, whose sum is σ = 1131131022. Its totient is φ = 1131131020.

The previous prime is 1131131011. The next prime is 1131131063. The reversal of 1131131021 is 1201311311.

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., 825930121 + 305200900 = 28739^2 + 17470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131131021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1131130987 and 1131131005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131131011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565565510 + 565565511.

It is an arithmetic number, because the mean of its divisors is an integer number (565565511).

Almost surely, 2^1131131021 is an apocalyptic number.

It is an amenable number.

1131131021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131131021 is an equidigital number, since it uses as much as digits as its factorization.

1131131021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1131131021 is about 33632.2913432909. The cubic root of 1131131021 is about 1041.9278286128.

Adding to 1131131021 its reverse (1201311311), we get a palindrome (2332442332).

The spelling of 1131131021 in words is "one billion, one hundred thirty-one million, one hundred thirty-one thousand, twenty-one".