1213444445 has 16 divisors (see below), whose sum is σ = 1567926720. Its totient is φ = 898162944.

The previous prime is 1213444429. The next prime is 1213444447. The reversal of 1213444445 is 5444443121.

It is a cyclic number.

It is not a de Polignac number, because 1213444445 - 2⁴ = 1213444429 is a prime.

It is a super-2 number, since 2×1213444445² = 2944894842202716050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213444447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115967 + ... + 125996.

It is an arithmetic number, because the mean of its divisors is an integer number (97995420).

Almost surely, 2^1213444445 is an apocalyptic number.

It is an amenable number.

1213444445 is a deficient number, since it is larger than the sum of its proper divisors (354482275).

1213444445 is a wasteful number, since it uses less digits than its factorization.

1213444445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242044.

The product of its digits is 30720, while the sum is 32.

The square root of 1213444445 is about 34834.5294930188. The cubic root of 1213444445 is about 1066.6124105975.

Adding to 1213444445 its reverse (5444443121), we get a palindrome (6657887566).

The spelling of 1213444445 in words is "one billion, two hundred thirteen million, four hundred forty-four thousand, four hundred forty-five".