181113210001 has 2 divisors, whose sum is σ = 181113210002. Its totient is φ = 181113210000.

The previous prime is 181113209989. The next prime is 181113210017. The reversal of 181113210001 is 100012311181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175352400001 + 5760810000 = 418751^2 + 75900^2 .

It is an emirp because it is prime and its reverse (100012311181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 181113210001 - 2⁷ = 181113209873 is a prime.

It is not a weakly prime, because it can be changed into another prime (181113210101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90556605000 + 90556605001.

It is an arithmetic number, because the mean of its divisors is an integer number (90556605001).

Almost surely, 2^181113210001 is an apocalyptic number.

It is an amenable number.

181113210001 is a deficient number, since it is larger than the sum of its proper divisors (1).

181113210001 is an equidigital number, since it uses as much as digits as its factorization.

181113210001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 181113210001 its reverse (100012311181), we get a palindrome (281125521182).

The spelling of 181113210001 in words is "one hundred eighty-one billion, one hundred thirteen million, two hundred ten thousand, one".