1213606045 has 4 divisors (see below), whose sum is σ = 1456327260. Its totient is φ = 970884832.

The previous prime is 1213606039. The next prime is 1213606061. The reversal of 1213606045 is 5406063121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 239042521 + 974563524 = 15461^2 + 31218^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213606045 - 2¹¹ = 1213603997 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 121360600 + ... + 121360609.

It is an arithmetic number, because the mean of its divisors is an integer number (364081815).

Almost surely, 2^1213606045 is an apocalyptic number.

It is an amenable number.

1213606045 is a deficient number, since it is larger than the sum of its proper divisors (242721215).

1213606045 is an equidigital number, since it uses as much as digits as its factorization.

1213606045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242721214.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1213606045 is about 34836.8489533712. The cubic root of 1213606045 is about 1066.6597570624.

Adding to 1213606045 its reverse (5406063121), we get a palindrome (6619669166).

The spelling of 1213606045 in words is "one billion, two hundred thirteen million, six hundred six thousand, forty-five".