1111111615121 has 2 divisors, whose sum is σ = 1111111615122. Its totient is φ = 1111111615120.

The previous prime is 1111111615099. The next prime is 1111111615181. The reversal of 1111111615121 is 1215161111111.

It is a m-pointer prime, because the next prime (1111111615181) can be obtained adding 1111111615121 to its product of digits (60).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 758055800896 + 353055814225 = 870664^2 + 594185^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111111615121 - 2¹⁸ = 1111111352977 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1111111615181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555555807560 + 555555807561.

It is an arithmetic number, because the mean of its divisors is an integer number (555555807561).

Almost surely, 2^{1111111615121} is an apocalyptic number.

It is an amenable number.

1111111615121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111111615121 is an equidigital number, since it uses as much as digits as its factorization.

1111111615121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60, while the sum is 23.

Adding to 1111111615121 its reverse (1215161111111), we get a palindrome (2326272726232).

The spelling of 1111111615121 in words is "one trillion, one hundred eleven billion, one hundred eleven million, six hundred fifteen thousand, one hundred twenty-one".