111145381 has 2 divisors, whose sum is σ = 111145382. Its totient is φ = 111145380.

The previous prime is 111145357. The next prime is 111145457. The reversal of 111145381 is 183541111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81540900 + 29604481 = 9030^2 + 5441^2 .

It is a cyclic number.

It is not a de Polignac number, because 111145381 - 2⁷ = 111145253 is a prime.

It is a super-2 number, since 2×111145381² = 24706591435270322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111145351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55572690 + 55572691.

It is an arithmetic number, because the mean of its divisors is an integer number (55572691).

Almost surely, 2^111145381 is an apocalyptic number.

It is an amenable number.

111145381 is a deficient number, since it is larger than the sum of its proper divisors (1).

111145381 is an equidigital number, since it uses as much as digits as its factorization.

111145381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 25.

The square root of 111145381 is about 10542.5509721319. The cubic root of 111145381 is about 480.7992774211.

Adding to 111145381 its reverse (183541111), we get a palindrome (294686492).

The spelling of 111145381 in words is "one hundred eleven million, one hundred forty-five thousand, three hundred eighty-one".