111236381 has 2 divisors, whose sum is σ = 111236382. Its totient is φ = 111236380.

The previous prime is 111236371. The next prime is 111236387. The reversal of 111236381 is 183632111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58905625 + 52330756 = 7675^2 + 7234^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111236381 is a prime.

It is a super-2 number, since 2×111236381² = 24747064915954322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111236381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111236387) 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, 55618190 + 55618191.

It is an arithmetic number, because the mean of its divisors is an integer number (55618191).

Almost surely, 2^111236381 is an apocalyptic number.

It is an amenable number.

111236381 is a deficient number, since it is larger than the sum of its proper divisors (1).

111236381 is an equidigital number, since it uses as much as digits as its factorization.

111236381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 26.

The square root of 111236381 is about 10546.8659325887. The cubic root of 111236381 is about 480.9304593574.

Adding to 111236381 its reverse (183632111), we get a palindrome (294868492).

The spelling of 111236381 in words is "one hundred eleven million, two hundred thirty-six thousand, three hundred eighty-one".