121611311 has 2 divisors, whose sum is σ = 121611312. Its totient is φ = 121611310.

The previous prime is 121611277. The next prime is 121611337. The reversal of 121611311 is 113116121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121611311 is a prime.

It is a Chen prime.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 121611311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121611011) 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, 60805655 + 60805656.

It is an arithmetic number, because the mean of its divisors is an integer number (60805656).

Almost surely, 2^121611311 is an apocalyptic number.

121611311 is a deficient number, since it is larger than the sum of its proper divisors (1).

121611311 is an equidigital number, since it uses as much as digits as its factorization.

121611311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36, while the sum is 17.

The square root of 121611311 is about 11027.7518561128. The cubic root of 121611311 is about 495.4402925365.

Adding to 121611311 its reverse (113116121), we get a palindrome (234727432).

The spelling of 121611311 in words is "one hundred twenty-one million, six hundred eleven thousand, three hundred eleven".