1002121181 has 2 divisors, whose sum is σ = 1002121182. Its totient is φ = 1002121180.

The previous prime is 1002121171. The next prime is 1002121217. The reversal of 1002121181 is 1811212001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 929701081 + 72420100 = 30491^2 + 8510^2 .

It is an emirp because it is prime and its reverse (1811212001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1002121181 - 2¹⁰ = 1002120157 is a prime.

It is a super-2 number, since 2×1002121181² = 2008493722817669522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1002121111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501060590 + 501060591.

It is an arithmetic number, because the mean of its divisors is an integer number (501060591).

Almost surely, 2^1002121181 is an apocalyptic number.

It is an amenable number.

1002121181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002121181 is an equidigital number, since it uses as much as digits as its factorization.

1002121181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

The square root of 1002121181 is about 31656.2976514942. The cubic root of 1002121181 is about 1000.7065609873.

Adding to 1002121181 its reverse (1811212001), we get a palindrome (2813333182).

The spelling of 1002121181 in words is "one billion, two million, one hundred twenty-one thousand, one hundred eighty-one".