1211202009 has 24 divisors (see below), whose sum is σ = 1875893760. Its totient is φ = 750342528.

The previous prime is 1211202007. The next prime is 1211202019. The reversal of 1211202009 is 9002021121.

It is not a de Polignac number, because 1211202009 - 2¹ = 1211202007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211201982 and 1211202000.

It is not an unprimeable number, because it can be changed into a prime (1211202007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38017 + ... + 62190.

It is an arithmetic number, because the mean of its divisors is an integer number (78162240).

Almost surely, 2^1211202009 is an apocalyptic number.

It is an amenable number.

1211202009 is a deficient number, since it is larger than the sum of its proper divisors (664691751).

1211202009 is a wasteful number, since it uses less digits than its factorization.

1211202009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100309 (or 100306 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1211202009 is about 34802.3276376739. The cubic root of 1211202009 is about 1065.9549749424.

The spelling of 1211202009 in words is "one billion, two hundred eleven million, two hundred two thousand, nine".