1243120317 has 8 divisors (see below), whose sum is σ = 1664732640. Its totient is φ = 825127440.

The previous prime is 1243120309. The next prime is 1243120331. The reversal of 1243120317 is 7130213421.

It is a happy number.

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

It is not a de Polignac number, because 1243120317 - 2³ = 1243120309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243120337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 904059 + ... + 905432.

It is an arithmetic number, because the mean of its divisors is an integer number (208091580).

Almost surely, 2^1243120317 is an apocalyptic number.

It is an amenable number.

1243120317 is a deficient number, since it is larger than the sum of its proper divisors (421612323).

1243120317 is a wasteful number, since it uses less digits than its factorization.

1243120317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809723.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 1243120317 is about 35257.9114100651. The cubic root of 1243120317 is about 1075.2374646131.

Adding to 1243120317 its reverse (7130213421), we get a palindrome (8373333738).

The spelling of 1243120317 in words is "one billion, two hundred forty-three million, one hundred twenty thousand, three hundred seventeen".