1212969809 has 8 divisors (see below), whose sum is σ = 1234314240. Its totient is φ = 1191720816.

The previous prime is 1212969803. The next prime is 1212969827. The reversal of 1212969809 is 9089692121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212969809 - 2¹² = 1212965713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212969803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2027 + ... + 49295.

It is an arithmetic number, because the mean of its divisors is an integer number (154289280).

Almost surely, 2^1212969809 is an apocalyptic number.

It is an amenable number.

1212969809 is a deficient number, since it is larger than the sum of its proper divisors (21344431).

1212969809 is an equidigital number, since it uses as much as digits as its factorization.

1212969809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47719.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 1212969809 is about 34827.7161037011. The cubic root of 1212969809 is about 1066.4733247989.

The spelling of 1212969809 in words is "one billion, two hundred twelve million, nine hundred sixty-nine thousand, eight hundred nine".