1299371189 has 2 divisors, whose sum is σ = 1299371190. Its totient is φ = 1299371188.

The previous prime is 1299371179. The next prime is 1299371239. The reversal of 1299371189 is 9811739921.

It is an a-pointer prime, because the next prime (1299371239) can be obtained adding 1299371189 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 914034289 + 385336900 = 30233^2 + 19630^2 .

It is an emirp because it is prime and its reverse (9811739921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1299371189 - 2⁴ = 1299371173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1299371179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649685594 + 649685595.

It is an arithmetic number, because the mean of its divisors is an integer number (649685595).

Almost surely, 2^1299371189 is an apocalyptic number.

It is an amenable number.

1299371189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299371189 is an equidigital number, since it uses as much as digits as its factorization.

1299371189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 50.

The square root of 1299371189 is about 36046.7916602851. The cubic root of 1299371189 is about 1091.2168854890.

The spelling of 1299371189 in words is "one billion, two hundred ninety-nine million, three hundred seventy-one thousand, one hundred eighty-nine".