1243243013 has 8 divisors (see below), whose sum is σ = 1290512640. Its totient is φ = 1196840880.

The previous prime is 1243243009. The next prime is 1243243039. The reversal of 1243243013 is 3103423421.

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

It is a cyclic number.

It is not a de Polignac number, because 1243243013 - 2² = 1243243009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1243243013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243243073) 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 7 ways as a sum of consecutive naturals, for example, 213953 + ... + 219686.

It is an arithmetic number, because the mean of its divisors is an integer number (161314080).

Almost surely, 2^1243243013 is an apocalyptic number.

It is an amenable number.

1243243013 is a deficient number, since it is larger than the sum of its proper divisors (47269627).

1243243013 is an equidigital number, since it uses as much as digits as its factorization.

1243243013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433747.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 1243243013 is about 35259.6513454118. The cubic root of 1243243013 is about 1075.2728387691.

Adding to 1243243013 its reverse (3103423421), we get a palindrome (4346666434).

The spelling of 1243243013 in words is "one billion, two hundred forty-three million, two hundred forty-three thousand, thirteen".