777121979 has 2 divisors, whose sum is σ = 777121980. Its totient is φ = 777121978.

The previous prime is 777121957. The next prime is 777122029. The reversal of 777121979 is 979121777.

It is an a-pointer prime, because the next prime (777122029) can be obtained adding 777121979 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 777121979 - 2¹⁶ = 777056443 is a prime.

It is not a weakly prime, because it can be changed into another prime (777121949) 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, 388560989 + 388560990.

It is an arithmetic number, because the mean of its divisors is an integer number (388560990).

Almost surely, 2^777121979 is an apocalyptic number.

777121979 is a deficient number, since it is larger than the sum of its proper divisors (1).

777121979 is an equidigital number, since it uses as much as digits as its factorization.

777121979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388962, while the sum is 50.

The square root of 777121979 is about 27876.9076297928. The cubic root of 777121979 is about 919.3828481475.

The spelling of 777121979 in words is "seven hundred seventy-seven million, one hundred twenty-one thousand, nine hundred seventy-nine".