1236115121 has 2 divisors, whose sum is σ = 1236115122. Its totient is φ = 1236115120.

The previous prime is 1236115117. The next prime is 1236115123. The reversal of 1236115121 is 1215116321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 930250000 + 305865121 = 30500^2 + 17489^2 .

It is a cyclic number.

It is not a de Polignac number, because 1236115121 - 2² = 1236115117 is a prime.

Together with 1236115123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1236115123) 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, 618057560 + 618057561.

It is an arithmetic number, because the mean of its divisors is an integer number (618057561).

Almost surely, 2^1236115121 is an apocalyptic number.

It is an amenable number.

1236115121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1236115121 is an equidigital number, since it uses as much as digits as its factorization.

1236115121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 23.

The square root of 1236115121 is about 35158.4288755911. The cubic root of 1236115121 is about 1073.2139430899.

The spelling of 1236115121 in words is "one billion, two hundred thirty-six million, one hundred fifteen thousand, one hundred twenty-one".