770998121 has 2 divisors, whose sum is σ = 770998122. Its totient is φ = 770998120.

The previous prime is 770998097. The next prime is 770998133. The reversal of 770998121 is 121899077.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 669774400 + 101223721 = 25880^2 + 10061^2 .

It is an emirp because it is prime and its reverse (121899077) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-770998121 is a prime.

It is not a weakly prime, because it can be changed into another prime (770998171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385499060 + 385499061.

It is an arithmetic number, because the mean of its divisors is an integer number (385499061).

Almost surely, 2^770998121 is an apocalyptic number.

It is an amenable number.

770998121 is a deficient number, since it is larger than the sum of its proper divisors (1).

770998121 is an equidigital number, since it uses as much as digits as its factorization.

770998121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 44.

The square root of 770998121 is about 27766.8529185430. The cubic root of 770998121 is about 916.9615105460.

The spelling of 770998121 in words is "seven hundred seventy million, nine hundred ninety-eight thousand, one hundred twenty-one".