121979783 has 2 divisors, whose sum is σ = 121979784. Its totient is φ = 121979782.

The previous prime is 121979773. The next prime is 121979807. The reversal of 121979783 is 387979121.

It is a weak prime.

It is an emirp because it is prime and its reverse (387979121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121979783 - 2⁶ = 121979719 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121979773) 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, 60989891 + 60989892.

It is an arithmetic number, because the mean of its divisors is an integer number (60989892).

Almost surely, 2^121979783 is an apocalyptic number.

121979783 is a deficient number, since it is larger than the sum of its proper divisors (1).

121979783 is an equidigital number, since it uses as much as digits as its factorization.

121979783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 47.

The square root of 121979783 is about 11044.4457986809. The cubic root of 121979783 is about 495.9401687607.

The spelling of 121979783 in words is "one hundred twenty-one million, nine hundred seventy-nine thousand, seven hundred eighty-three".