1001011002181 has 2 divisors, whose sum is σ = 1001011002182. Its totient is φ = 1001011002180.

The previous prime is 1001011002161. The next prime is 1001011002239. The reversal of 1001011002181 is 1812001101001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 965286600100 + 35724402081 = 982490^2 + 189009^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001011002181 - 2⁷ = 1001011002053 is a prime.

It is a super-2 number, since 2×1001011002181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001011002151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500505501090 + 500505501091.

It is an arithmetic number, because the mean of its divisors is an integer number (500505501091).

Almost surely, 2^{1001011002181} is an apocalyptic number.

It is an amenable number.

1001011002181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001011002181 is an equidigital number, since it uses as much as digits as its factorization.

1001011002181 is an odious number, because the sum of its binary digits is odd.

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

Adding to 1001011002181 its reverse (1812001101001), we get a palindrome (2813012103182).

The spelling of 1001011002181 in words is "one trillion, one billion, eleven million, two thousand, one hundred eighty-one".