1299386189 has 2 divisors, whose sum is σ = 1299386190. Its totient is φ = 1299386188.

The previous prime is 1299386171. The next prime is 1299386281. The reversal of 1299386189 is 9816839921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 809118025 + 490268164 = 28445^2 + 22142^2 .

It is a cyclic number.

It is not a de Polignac number, because 1299386189 - 2¹² = 1299382093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1299386129) 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, 649693094 + 649693095.

It is an arithmetic number, because the mean of its divisors is an integer number (649693095).

Almost surely, 2^1299386189 is an apocalyptic number.

It is an amenable number.

1299386189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299386189 is an equidigital number, since it uses as much as digits as its factorization.

1299386189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 56.

The square root of 1299386189 is about 36046.9997225844. Note that the first 3 decimals coincide. The cubic root of 1299386189 is about 1091.2210844919.

The spelling of 1299386189 in words is "one billion, two hundred ninety-nine million, three hundred eighty-six thousand, one hundred eighty-nine".