1200001233 has 4 divisors (see below), whose sum is σ = 1600001648. Its totient is φ = 800000820.

The previous prime is 1200001193. The next prime is 1200001247. The reversal of 1200001233 is 3321000021.

It is a happy number.

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 de Polignac number, because none of the positive numbers 2^k-1200001233 is a prime.

It is a Duffinian number.

1200001233 is a modest number, since divided by 1233 gives 12 as remainder.

It is not an unprimeable number, because it can be changed into a prime (1200001433) 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 3 ways as a sum of consecutive naturals, for example, 200000203 + ... + 200000208.

It is an arithmetic number, because the mean of its divisors is an integer number (400000412).

Almost surely, 2^1200001233 is an apocalyptic number.

It is an amenable number.

1200001233 is a deficient number, since it is larger than the sum of its proper divisors (400000415).

1200001233 is an equidigital number, since it uses as much as digits as its factorization.

1200001233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400000414.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 1200001233 is about 34641.0339481950. The cubic root of 1200001233 is about 1062.6589331430.

Adding to 1200001233 its reverse (3321000021), we get a palindrome (4521001254).

The spelling of 1200001233 in words is "one billion, two hundred million, one thousand, two hundred thirty-three".