770123009 has 2 divisors, whose sum is σ = 770123010. Its totient is φ = 770123008.

The previous prime is 770122999. The next prime is 770123021. The reversal of 770123009 is 900321077.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 739840000 + 30283009 = 27200^2 + 5503^2 .

It is a cyclic number.

It is not a de Polignac number, because 770123009 - 2⁴ = 770122993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (770123909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385061504 + 385061505.

It is an arithmetic number, because the mean of its divisors is an integer number (385061505).

Almost surely, 2^770123009 is an apocalyptic number.

It is an amenable number.

770123009 is a deficient number, since it is larger than the sum of its proper divisors (1).

770123009 is an equidigital number, since it uses as much as digits as its factorization.

770123009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2646, while the sum is 29.

The square root of 770123009 is about 27751.0902308360. The cubic root of 770123009 is about 916.6144505500.

The spelling of 770123009 in words is "seven hundred seventy million, one hundred twenty-three thousand, nine".