1299916549 has 2 divisors, whose sum is σ = 1299916550. Its totient is φ = 1299916548.

The previous prime is 1299916529. The next prime is 1299916573. The reversal of 1299916549 is 9456199921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1095941025 + 203975524 = 33105^2 + 14282^2 .

It is a cyclic number.

It is not a de Polignac number, because 1299916549 - 2⁷ = 1299916421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1299916549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1299916529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649958274 + 649958275.

It is an arithmetic number, because the mean of its divisors is an integer number (649958275).

Almost surely, 2^1299916549 is an apocalyptic number.

It is an amenable number.

1299916549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299916549 is an equidigital number, since it uses as much as digits as its factorization.

1299916549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1574640, while the sum is 55.

The square root of 1299916549 is about 36054.3554789154. The cubic root of 1299916549 is about 1091.3695292723.

The spelling of 1299916549 in words is "one billion, two hundred ninety-nine million, nine hundred sixteen thousand, five hundred forty-nine".