1800112222001 has 2 divisors, whose sum is σ = 1800112222002. Its totient is φ = 1800112222000.

The previous prime is 1800112221979. The next prime is 1800112222019. The reversal of 1800112222001 is 1002222110081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1796243257600 + 3868964401 = 1340240^2 + 62201^2 .

It is an emirp because it is prime and its reverse (1002222110081) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1800112222001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1800112222031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900056111000 + 900056111001.

It is an arithmetic number, because the mean of its divisors is an integer number (900056111001).

Almost surely, 2^{1800112222001} is an apocalyptic number.

It is an amenable number.

1800112222001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1800112222001 is an equidigital number, since it uses as much as digits as its factorization.

1800112222001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 1800112222001 its reverse (1002222110081), we get a palindrome (2802334332082).

The spelling of 1800112222001 in words is "one trillion, eight hundred billion, one hundred twelve million, two hundred twenty-two thousand, one".