770000009 has 2 divisors, whose sum is σ = 770000010. Its totient is φ = 770000008.

The previous prime is 769999963. The next prime is 770000017. The reversal of 770000009 is 900000077.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 645007609 + 124992400 = 25397^2 + 11180^2 .

It is a cyclic number.

It is not a de Polignac number, because 770000009 - 2¹² = 769995913 is a prime.

It is not a weakly prime, because it can be changed into another prime (770000809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385000004 + 385000005.

It is an arithmetic number, because the mean of its divisors is an integer number (385000005).

Almost surely, 2^770000009 is an apocalyptic number.

It is an amenable number.

770000009 is a deficient number, since it is larger than the sum of its proper divisors (1).

770000009 is an equidigital number, since it uses as much as digits as its factorization.

770000009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 441, while the sum is 23.

The square root of 770000009 is about 27748.8740131920. The cubic root of 770000009 is about 916.5656490041.

The spelling of 770000009 in words is "seven hundred seventy million, nine", and thus it is an aban number.