1212630005 has 4 divisors (see below), whose sum is σ = 1455156012. Its totient is φ = 970104000.

The previous prime is 1212629993. The next prime is 1212630011. The reversal of 1212630005 is 5000362121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5000362121 = 317 ⋅15774013.

It can be written as a sum of positive squares in 2 ways, for example, as 721298449 + 491331556 = 26857^2 + 22166^2 .

It is not a de Polignac number, because 1212630005 - 2¹⁰ = 1212628981 is a prime.

It is a super-3 number, since 3×1212630005³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent 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, 121262996 + ... + 121263005.

It is an arithmetic number, because the mean of its divisors is an integer number (363789003).

Almost surely, 2^1212630005 is an apocalyptic number.

It is an amenable number.

1212630005 is a deficient number, since it is larger than the sum of its proper divisors (242526007).

1212630005 is an equidigital number, since it uses as much as digits as its factorization.

1212630005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242526006.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1212630005 is about 34822.8374059323. The cubic root of 1212630005 is about 1066.3737274458.

Adding to 1212630005 its reverse (5000362121), we get a palindrome (6212992126).

The spelling of 1212630005 in words is "one billion, two hundred twelve million, six hundred thirty thousand, five".