1131021011 has 2 divisors, whose sum is σ = 1131021012. Its totient is φ = 1131021010.

The previous prime is 1131020993. The next prime is 1131021013. The reversal of 1131021011 is 1101201311.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131021011 is a prime.

Together with 1131021013, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1131020983 and 1131021001.

It is not a weakly prime, because it can be changed into another prime (1131021013) 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, 565510505 + 565510506.

It is an arithmetic number, because the mean of its divisors is an integer number (565510506).

Almost surely, 2^1131021011 is an apocalyptic number.

1131021011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131021011 is an equidigital number, since it uses as much as digits as its factorization.

1131021011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 1131021011 is about 33630.6558217350. The cubic root of 1131021011 is about 1041.8940493852.

Adding to 1131021011 its reverse (1101201311), we get a palindrome (2232222322).

The spelling of 1131021011 in words is "one billion, one hundred thirty-one million, twenty-one thousand, eleven".