1213204445 has 8 divisors (see below), whose sum is σ = 1456727640. Its totient is φ = 969975360.

The previous prime is 1213204441. The next prime is 1213204471. The reversal of 1213204445 is 5444023121.

It can be written as a sum of positive squares in 4 ways, for example, as 51008164 + 1162196281 = 7142^2 + 34091^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1213204445 - 2² = 1213204441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213204441) 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 7 ways as a sum of consecutive naturals, for example, 64346 + ... + 81035.

It is an arithmetic number, because the mean of its divisors is an integer number (182090955).

Almost surely, 2^1213204445 is an apocalyptic number.

It is an amenable number.

1213204445 is a deficient number, since it is larger than the sum of its proper divisors (243523195).

1213204445 is a wasteful number, since it uses less digits than its factorization.

1213204445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147055.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 1213204445 is about 34831.0844648857. The cubic root of 1213204445 is about 1066.5420863075.

Adding to 1213204445 its reverse (5444023121), we get a palindrome (6657227566).

The spelling of 1213204445 in words is "one billion, two hundred thirteen million, two hundred four thousand, four hundred forty-five".