111005381 has 2 divisors, whose sum is σ = 111005382. Its totient is φ = 111005380.

The previous prime is 111005371. The next prime is 111005407. The reversal of 111005381 is 183500111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103530625 + 7474756 = 10175^2 + 2734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111005381 is a prime.

It is a super-2 number, since 2×111005381² = 24644389221910322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111005311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55502690 + 55502691.

It is an arithmetic number, because the mean of its divisors is an integer number (55502691).

Almost surely, 2^111005381 is an apocalyptic number.

It is an amenable number.

111005381 is a deficient number, since it is larger than the sum of its proper divisors (1).

111005381 is an equidigital number, since it uses as much as digits as its factorization.

111005381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 20.

The square root of 111005381 is about 10535.9091207166. The cubic root of 111005381 is about 480.5973191681.

Adding to 111005381 its reverse (183500111), we get a palindrome (294505492).

The spelling of 111005381 in words is "one hundred eleven million, five thousand, three hundred eighty-one".