1121320181 has 2 divisors, whose sum is σ = 1121320182. Its totient is φ = 1121320180.

The previous prime is 1121320147. The next prime is 1121320183. The reversal of 1121320181 is 1810231211.

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., 952709956 + 168610225 = 30866^2 + 12985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121320181 is a prime.

It is a super-2 number, since 2×1121320181² = 2514717896635745522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1121320183, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121320183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560660090 + 560660091.

It is an arithmetic number, because the mean of its divisors is an integer number (560660091).

Almost surely, 2^1121320181 is an apocalyptic number.

It is an amenable number.

1121320181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121320181 is an equidigital number, since it uses as much as digits as its factorization.

1121320181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 1121320181 is about 33486.1192287192. The cubic root of 1121320181 is about 1038.9066977750.

Adding to 1121320181 its reverse (1810231211), we get a palindrome (2931551392).

The spelling of 1121320181 in words is "one billion, one hundred twenty-one million, three hundred twenty thousand, one hundred eighty-one".