1208815009 has 4 divisors (see below), whose sum is σ = 1216231216. Its totient is φ = 1201398804.

The previous prime is 1208814983. The next prime is 1208815019. The reversal of 1208815009 is 9005188021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9005188021 = 9539 ⋅944039.

It is a cyclic number.

It is not a de Polignac number, because 1208815009 - 2¹³ = 1208806817 is a prime.

It is a super-2 number, since 2×1208815009² = 2922467451967340162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1208815019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3707859 + ... + 3708184.

It is an arithmetic number, because the mean of its divisors is an integer number (304057804).

Almost surely, 2^1208815009 is an apocalyptic number.

It is an amenable number.

1208815009 is a deficient number, since it is larger than the sum of its proper divisors (7416207).

1208815009 is an equidigital number, since it uses as much as digits as its factorization.

1208815009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7416206.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 1208815009 is about 34768.0170415283. The cubic root of 1208815009 is about 1065.2542639031.

The spelling of 1208815009 in words is "one billion, two hundred eight million, eight hundred fifteen thousand, nine".