1299867859 has 2 divisors, whose sum is σ = 1299867860. Its totient is φ = 1299867858.

The previous prime is 1299867847. The next prime is 1299867893. The reversal of 1299867859 is 9587689921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1299867859 - 2¹⁷ = 1299736787 is a prime.

It is a super-2 number, since 2×1299867859² = 3379312901722487762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1299867859.

It is not a weakly prime, because it can be changed into another prime (1299867809) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649933929 + 649933930.

It is an arithmetic number, because the mean of its divisors is an integer number (649933930).

Almost surely, 2^1299867859 is an apocalyptic number.

1299867859 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299867859 is an equidigital number, since it uses as much as digits as its factorization.

1299867859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19595520, while the sum is 64.

The square root of 1299867859 is about 36053.6802421057. The cubic root of 1299867859 is about 1091.3559028986.

The spelling of 1299867859 in words is "one billion, two hundred ninety-nine million, eight hundred sixty-seven thousand, eight hundred fifty-nine".