121111979 has 2 divisors, whose sum is σ = 121111980. Its totient is φ = 121111978.

The previous prime is 121111967. The next prime is 121111999. The reversal of 121111979 is 979111121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121111979 is a prime.

It is a super-2 number, since 2×121111979² = 29336222914592882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121111919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60555989 + 60555990.

It is an arithmetic number, because the mean of its divisors is an integer number (60555990).

Almost surely, 2^121111979 is an apocalyptic number.

121111979 is a deficient number, since it is larger than the sum of its proper divisors (1).

121111979 is an equidigital number, since it uses as much as digits as its factorization.

121111979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1134, while the sum is 32.

The square root of 121111979 is about 11005.0887774702. The cubic root of 121111979 is about 494.7612752225.

The spelling of 121111979 in words is "one hundred twenty-one million, one hundred eleven thousand, nine hundred seventy-nine".