1346647789 has 2 divisors, whose sum is σ = 1346647790. Its totient is φ = 1346647788.

The previous prime is 1346647777. The next prime is 1346647793. The reversal of 1346647789 is 9877466431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 994897764 + 351750025 = 31542^2 + 18755^2 .

It is a cyclic number.

It is not a de Polignac number, because 1346647789 - 2¹⁹ = 1346123501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1346647759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 673323894 + 673323895.

It is an arithmetic number, because the mean of its divisors is an integer number (673323895).

Almost surely, 2^1346647789 is an apocalyptic number.

It is an amenable number.

1346647789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1346647789 is an equidigital number, since it uses as much as digits as its factorization.

1346647789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 55.

The square root of 1346647789 is about 36696.6999742484. The cubic root of 1346647789 is about 1104.2939024126.

The spelling of 1346647789 in words is "one billion, three hundred forty-six million, six hundred forty-seven thousand, seven hundred eighty-nine".