1211410505 has 4 divisors (see below), whose sum is σ = 1453692612. Its totient is φ = 969128400.

The previous prime is 1211410469. The next prime is 1211410507. The reversal of 1211410505 is 5050141121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5050141121 = 14251 ⋅354371.

It can be written as a sum of positive squares in 2 ways, for example, as 813846784 + 397563721 = 28528^2 + 19939^2 .

It is not a de Polignac number, because 1211410505 - 2⁶ = 1211410441 is a prime.

It is a super-3 number, since 3×1211410505³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211410507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121141046 + ... + 121141055.

It is an arithmetic number, because the mean of its divisors is an integer number (363423153).

Almost surely, 2^1211410505 is an apocalyptic number.

It is an amenable number.

1211410505 is a deficient number, since it is larger than the sum of its proper divisors (242282107).

1211410505 is an equidigital number, since it uses as much as digits as its factorization.

1211410505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242282106.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 1211410505 is about 34805.3229406078. The cubic root of 1211410505 is about 1066.0161358375.

Adding to 1211410505 its reverse (5050141121), we get a palindrome (6261551626).

The spelling of 1211410505 in words is "one billion, two hundred eleven million, four hundred ten thousand, five hundred five".