1299999249 has 6 divisors (see below), whose sum is σ = 1877776706. Its totient is φ = 866666160.

The previous prime is 1299999199. The next prime is 1299999277. The reversal of 1299999249 is 9429999921.

It can be written as a sum of positive squares in only one way, i.e., 705858624 + 594140625 = 26568^2 + 24375^2 .

It is not a de Polignac number, because 1299999249 - 2²³ = 1291610641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1299999049) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72222172 + ... + 72222189.

Almost surely, 2^1299999249 is an apocalyptic number.

It is an amenable number.

1299999249 is a deficient number, since it is larger than the sum of its proper divisors (577777457).

1299999249 is a wasteful number, since it uses less digits than its factorization.

1299999249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144444367 (or 144444364 counting only the distinct ones).

The product of its digits is 8503056, while the sum is 63.

The square root of 1299999249 is about 36055.5023401422. The cubic root of 1299999249 is about 1091.3926728980.

The spelling of 1299999249 in words is "one billion, two hundred ninety-nine million, nine hundred ninety-nine thousand, two hundred forty-nine".