121979243 has 2 divisors, whose sum is σ = 121979244. Its totient is φ = 121979242.

The previous prime is 121979219. The next prime is 121979279. The reversal of 121979243 is 342979121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121979243 - 2¹⁶ = 121913707 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121979197 and 121979206.

It is not a weakly prime, because it can be changed into another prime (121979213) 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, 60989621 + 60989622.

It is an arithmetic number, because the mean of its divisors is an integer number (60989622).

Almost surely, 2^121979243 is an apocalyptic number.

121979243 is a deficient number, since it is larger than the sum of its proper divisors (1).

121979243 is an equidigital number, since it uses as much as digits as its factorization.

121979243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 38.

The square root of 121979243 is about 11044.4213519768. The cubic root of 121979243 is about 495.9394369234.

The spelling of 121979243 in words is "one hundred twenty-one million, nine hundred seventy-nine thousand, two hundred forty-three".