1200001213 has 8 divisors (see below), whose sum is σ = 1203635160. Its totient is φ = 1196374080.

The previous prime is 1200001193. The next prime is 1200001247. The reversal of 1200001213 is 3121000021.

It can be written as a sum of positive squares in 4 ways, for example, as 8508889 + 1191492324 = 2917^2 + 34518^2 .

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 1200001213 - 2⁹ = 1200000701 is a prime.

It is a super-2 number, since 2×1200001213² = 2880005822402942738, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1200001213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200001013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 732231 + ... + 733867.

It is an arithmetic number, because the mean of its divisors is an integer number (150454395).

Almost surely, 2^1200001213 is an apocalyptic number.

It is an amenable number.

1200001213 is a deficient number, since it is larger than the sum of its proper divisors (3633947).

1200001213 is a wasteful number, since it uses less digits than its factorization.

1200001213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3407.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1200001213 is about 34641.0336595200. The cubic root of 1200001213 is about 1062.6589272394.

Adding to 1200001213 its reverse (3121000021), we get a palindrome (4321001234).

The spelling of 1200001213 in words is "one billion, two hundred million, one thousand, two hundred thirteen".