1213350305 has 4 divisors (see below), whose sum is σ = 1456020372. Its totient is φ = 970680240.

The previous prime is 1213350289. The next prime is 1213350319. The reversal of 1213350305 is 5030533121.

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 528586081 + 684764224 = 22991^2 + 26168^2 .

It is not a de Polignac number, because 1213350305 - 2⁴ = 1213350289 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121335026 + ... + 121335035.

It is an arithmetic number, because the mean of its divisors is an integer number (364005093).

Almost surely, 2^1213350305 is an apocalyptic number.

It is an amenable number.

1213350305 is a deficient number, since it is larger than the sum of its proper divisors (242670067).

1213350305 is an equidigital number, since it uses as much as digits as its factorization.

1213350305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242670066.

The product of its (nonzero) digits is 1350, while the sum is 23.

The square root of 1213350305 is about 34833.1782213452. The cubic root of 1213350305 is about 1066.5848270001.

Adding to 1213350305 its reverse (5030533121), we get a palindrome (6243883426).

The spelling of 1213350305 in words is "one billion, two hundred thirteen million, three hundred fifty thousand, three hundred five".