111231111023381 has 2 divisors, whose sum is σ = 111231111023382. Its totient is φ = 111231111023380.

The previous prime is 111231111023299. The next prime is 111231111023437. The reversal of 111231111023381 is 183320111132111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109682681702500 + 1548429320881 = 10472950^2 + 1244359^2 .

It is an emirp because it is prime and its reverse (183320111132111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111231111023381 is a prime.

It is a super-2 number, since 2×111231111023381² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111231111023881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55615555511690 + 55615555511691.

It is an arithmetic number, because the mean of its divisors is an integer number (55615555511691).

Almost surely, 2^{111231111023381} is an apocalyptic number.

It is an amenable number.

111231111023381 is a deficient number, since it is larger than the sum of its proper divisors (1).

111231111023381 is an equidigital number, since it uses as much as digits as its factorization.

111231111023381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 29.

Adding to 111231111023381 its reverse (183320111132111), we get a palindrome (294551222155492).

The spelling of 111231111023381 in words is "one hundred eleven trillion, two hundred thirty-one billion, one hundred eleven million, twenty-three thousand, three hundred eighty-one".