1211340506 has 4 divisors (see below), whose sum is σ = 1817010762. Its totient is φ = 605670252.

The previous prime is 1211340439. The next prime is 1211340511. The reversal of 1211340506 is 6050431121.

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

It can be written as a sum of positive squares in only one way, i.e., 718722481 + 492618025 = 26809^2 + 22195^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302835125 + ... + 302835128.

Almost surely, 2^1211340506 is an apocalyptic number.

1211340506 is a deficient number, since it is larger than the sum of its proper divisors (605670256).

1211340506 is an equidigital number, since it uses as much as digits as its factorization.

1211340506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605670255.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1211340506 is about 34804.3173471338. The cubic root of 1211340506 is about 1065.9956028856.

Adding to 1211340506 its reverse (6050431121), we get a palindrome (7261771627).

The spelling of 1211340506 in words is "one billion, two hundred eleven million, three hundred forty thousand, five hundred six".