11231320123181 has 2 divisors, whose sum is σ = 11231320123182. Its totient is φ = 11231320123180.

The previous prime is 11231320123157. The next prime is 11231320123213. The reversal of 11231320123181 is 18132102313211.

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., 11173369190281 + 57950932900 = 3342659^2 + 240730^2 .

It is a cyclic number.

It is not a de Polignac number, because 11231320123181 - 2³⁴ = 11214140253997 is a prime.

It is a super-2 number, since 2×11231320123181² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11231320023181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5615660061590 + 5615660061591.

It is an arithmetic number, because the mean of its divisors is an integer number (5615660061591).

Almost surely, 2^{11231320123181} is an apocalyptic number.

It is an amenable number.

11231320123181 is a deficient number, since it is larger than the sum of its proper divisors (1).

11231320123181 is an equidigital number, since it uses as much as digits as its factorization.

11231320123181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

Adding to 11231320123181 its reverse (18132102313211), we get a palindrome (29363422436392).

The spelling of 11231320123181 in words is "eleven trillion, two hundred thirty-one billion, three hundred twenty million, one hundred twenty-three thousand, one hundred eighty-one".