1245512005 has 4 divisors (see below), whose sum is σ = 1494614412. Its totient is φ = 996409600.

The previous prime is 1245511991. The next prime is 1245512011. The reversal of 1245512005 is 5002155421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5002155421 = 73 ⋅68522677.

It can be written as a sum of positive squares in 2 ways, for example, as 200024449 + 1045487556 = 14143^2 + 32334^2 .

It is not a de Polignac number, because 1245512005 - 2⁵ = 1245511973 is a prime.

It is a Duffinian 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, 124551196 + ... + 124551205.

It is an arithmetic number, because the mean of its divisors is an integer number (373653603).

Almost surely, 2^1245512005 is an apocalyptic number.

It is an amenable number.

1245512005 is a deficient number, since it is larger than the sum of its proper divisors (249102407).

1245512005 is an equidigital number, since it uses as much as digits as its factorization.

1245512005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249102406.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 1245512005 is about 35291.8121523959. The cubic root of 1245512005 is about 1075.9265867212.

Adding to 1245512005 its reverse (5002155421), we get a palindrome (6247667426).

The spelling of 1245512005 in words is "one billion, two hundred forty-five million, five hundred twelve thousand, five".