1213043445 has 40 divisors (see below), whose sum is σ = 2220793344. Its totient is φ = 633181536.

The previous prime is 1213043443. The next prime is 1213043453. The reversal of 1213043445 is 5443403121.

It is a happy number.

1213043445 is a `hidden beast` number, since 1 + 213 + 0 + 4 + 3 + 445 = 666.

It is not a de Polignac number, because 1213043445 - 2¹ = 1213043443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213043443) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 12829 + ... + 50898.

Almost surely, 2^1213043445 is an apocalyptic number.

1213043445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1213043445 is a deficient number, since it is larger than the sum of its proper divisors (1007749899).

1213043445 is an equidigital number, since it uses as much as digits as its factorization.

1213043445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63791 (or 63782 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 1213043445 is about 34828.7732342097. The cubic root of 1213043445 is about 1066.4949052318.

Adding to 1213043445 its reverse (5443403121), we get a palindrome (6656446566).

The spelling of 1213043445 in words is "one billion, two hundred thirteen million, forty-three thousand, four hundred forty-five".