11123021531161 has 2 divisors, whose sum is σ = 11123021531162. Its totient is φ = 11123021531160.

The previous prime is 11123021531159. The next prime is 11123021531243. The reversal of 11123021531161 is 16113512032111.

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., 8531101848025 + 2591919683136 = 2920805^2 + 1609944^2 .

It is a cyclic number.

It is not a de Polignac number, because 11123021531161 - 2¹ = 11123021531159 is a prime.

It is a super-3 number, since 3×11123021531161³ (a number of 40 digits) contains 333 as substring.

Together with 11123021531159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11123021531261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5561510765580 + 5561510765581.

It is an arithmetic number, because the mean of its divisors is an integer number (5561510765581).

Almost surely, 2^{11123021531161} is an apocalyptic number.

It is an amenable number.

11123021531161 is a deficient number, since it is larger than the sum of its proper divisors (1).

11123021531161 is an equidigital number, since it uses as much as digits as its factorization.

11123021531161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 28.

Adding to 11123021531161 its reverse (16113512032111), we get a palindrome (27236533563272).

The spelling of 11123021531161 in words is "eleven trillion, one hundred twenty-three billion, twenty-one million, five hundred thirty-one thousand, one hundred sixty-one".