1212202009 has 4 divisors (see below), whose sum is σ = 1212981120. Its totient is φ = 1211422900.

The previous prime is 1212201997. The next prime is 1212202031. The reversal of 1212202009 is 9002022121.

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.

It is a cyclic number.

It is not a de Polignac number, because 1212202009 - 2¹⁹ = 1211677721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212202039) 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, 387217 + ... + 390334.

It is an arithmetic number, because the mean of its divisors is an integer number (303245280).

Almost surely, 2^1212202009 is an apocalyptic number.

It is an amenable number.

1212202009 is a deficient number, since it is larger than the sum of its proper divisors (779111).

1212202009 is an equidigital number, since it uses as much as digits as its factorization.

1212202009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779110.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1212202009 is about 34816.6915286332. The cubic root of 1212202009 is about 1066.2482543297.

The spelling of 1212202009 in words is "one billion, two hundred twelve million, two hundred two thousand, nine".