1211340505 has 8 divisors (see below), whose sum is σ = 1478246400. Its totient is φ = 952647216.

The previous prime is 1211340439. The next prime is 1211340511. The reversal of 1211340505 is 5050431121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211340505 - 2¹⁵ = 1211307737 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2052825 + ... + 2053414.

It is an arithmetic number, because the mean of its divisors is an integer number (184780800).

Almost surely, 2^1211340505 is an apocalyptic number.

It is an amenable number.

1211340505 is a deficient number, since it is larger than the sum of its proper divisors (266905895).

1211340505 is an equidigital number, since it uses as much as digits as its factorization.

1211340505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4106303.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1211340505 is about 34804.3173327678. The cubic root of 1211340505 is about 1065.9956025923.

Adding to 1211340505 its reverse (5050431121), we get a palindrome (6261771626).

The spelling of 1211340505 in words is "one billion, two hundred eleven million, three hundred forty thousand, five hundred five".