1299565513 has 2 divisors, whose sum is σ = 1299565514. Its totient is φ = 1299565512.

The previous prime is 1299565511. The next prime is 1299565609. The reversal of 1299565513 is 3155659921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 828979264 + 470586249 = 28792^2 + 21693^2 .

It is an emirp because it is prime and its reverse (3155659921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1299565513 - 2¹ = 1299565511 is a prime.

Together with 1299565511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1299565511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649782756 + 649782757.

It is an arithmetic number, because the mean of its divisors is an integer number (649782757).

Almost surely, 2^1299565513 is an apocalyptic number.

It is an amenable number.

1299565513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299565513 is an equidigital number, since it uses as much as digits as its factorization.

1299565513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 364500, while the sum is 46.

The square root of 1299565513 is about 36049.4870005108. The cubic root of 1299565513 is about 1091.2712807898.

It can be divided in two parts, 1299565 and 513, that added together give a triangular number (1300078 = T₁₆₁₂).

The spelling of 1299565513 in words is "one billion, two hundred ninety-nine million, five hundred sixty-five thousand, five hundred thirteen".