111820901 has 2 divisors, whose sum is σ = 111820902. Its totient is φ = 111820900.

The previous prime is 111820873. The next prime is 111820931. The reversal of 111820901 is 109028111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60684100 + 51136801 = 7790^2 + 7151^2 .

It is an emirp because it is prime and its reverse (109028111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111820901 - 2¹⁸ = 111558757 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111820931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55910450 + 55910451.

It is an arithmetic number, because the mean of its divisors is an integer number (55910451).

Almost surely, 2^111820901 is an apocalyptic number.

It is an amenable number.

111820901 is a deficient number, since it is larger than the sum of its proper divisors (1).

111820901 is an equidigital number, since it uses as much as digits as its factorization.

111820901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 23.

The square root of 111820901 is about 10574.5402264117. The cubic root of 111820901 is about 481.7713788114.

The spelling of 111820901 in words is "one hundred eleven million, eight hundred twenty thousand, nine hundred one".