1241312005 has 4 divisors (see below), whose sum is σ = 1489574412. Its totient is φ = 993049600.

The previous prime is 1241311987. The next prime is 1241312021. The reversal of 1241312005 is 5002131421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5002131421 = 7 ⋅714590203.

It can be written as a sum of positive squares in 2 ways, for example, as 634133124 + 607178881 = 25182^2 + 24641^2 .

It is not a de Polignac number, because 1241312005 - 2²¹ = 1239214853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124131196 + ... + 124131205.

It is an arithmetic number, because the mean of its divisors is an integer number (372393603).

Almost surely, 2^1241312005 is an apocalyptic number.

It is an amenable number.

1241312005 is a deficient number, since it is larger than the sum of its proper divisors (248262407).

1241312005 is an equidigital number, since it uses as much as digits as its factorization.

1241312005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248262406.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1241312005 is about 35232.2580173341. The cubic root of 1241312005 is about 1074.7158448525.

Adding to 1241312005 its reverse (5002131421), we get a palindrome (6243443426).

The spelling of 1241312005 in words is "one billion, two hundred forty-one million, three hundred twelve thousand, five".