111200081 has 2 divisors, whose sum is σ = 111200082. Its totient is φ = 111200080.

The previous prime is 111200053. The next prime is 111200083. The reversal of 111200081 is 180002111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72250000 + 38950081 = 8500^2 + 6241^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111200081 is a prime.

It is a super-2 number, since 2×111200081² = 24730916028813122, which contains 22 as substring.

Together with 111200083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111200083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55600040 + 55600041.

It is an arithmetic number, because the mean of its divisors is an integer number (55600041).

Almost surely, 2^111200081 is an apocalyptic number.

It is an amenable number.

111200081 is a deficient number, since it is larger than the sum of its proper divisors (1).

111200081 is an equidigital number, since it uses as much as digits as its factorization.

111200081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 111200081 is about 10545.1449018020. The cubic root of 111200081 is about 480.8781393194.

Adding to 111200081 its reverse (180002111), we get a palindrome (291202192).

The spelling of 111200081 in words is "one hundred eleven million, two hundred thousand, eighty-one".