1299544247 has 2 divisors, whose sum is σ = 1299544248. Its totient is φ = 1299544246.

The previous prime is 1299544231. The next prime is 1299544249. The reversal of 1299544247 is 7424459921.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1299544247 - 2⁴ = 1299544231 is a prime.

Together with 1299544249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1299544249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649772123 + 649772124.

It is an arithmetic number, because the mean of its divisors is an integer number (649772124).

Almost surely, 2^1299544247 is an apocalyptic number.

1299544247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299544247 is an equidigital number, since it uses as much as digits as its factorization.

1299544247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 47.

The square root of 1299544247 is about 36049.1920436506. The cubic root of 1299544247 is about 1091.2653282615.

The spelling of 1299544247 in words is "one billion, two hundred ninety-nine million, five hundred forty-four thousand, two hundred forty-seven".