1200220909 has 4 divisors (see below), whose sum is σ = 1211232220. Its totient is φ = 1189209600.

The previous prime is 1200220907. The next prime is 1200220951. The reversal of 1200220909 is 9090220021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9090220021 = 4217 ⋅2155613.

It can be written as a sum of positive squares in 2 ways, for example, as 464618025 + 735602884 = 21555^2 + 27122^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200220909 - 2¹ = 1200220907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200220907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5505492 + ... + 5505709.

It is an arithmetic number, because the mean of its divisors is an integer number (302808055).

Almost surely, 2^1200220909 is an apocalyptic number.

It is an amenable number.

1200220909 is a deficient number, since it is larger than the sum of its proper divisors (11011311).

1200220909 is a wasteful number, since it uses less digits than its factorization.

1200220909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11011310.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1200220909 is about 34644.2045514109. The cubic root of 1200220909 is about 1062.7237737488.

The spelling of 1200220909 in words is "one billion, two hundred million, two hundred twenty thousand, nine hundred nine".