1243102513 has 4 divisors (see below), whose sum is σ = 1244758528. Its totient is φ = 1241446500.

The previous prime is 1243102463. The next prime is 1243102519. The reversal of 1243102513 is 3152013421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243102513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243102519) 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 3 ways as a sum of consecutive naturals, for example, 826881 + ... + 828382.

It is an arithmetic number, because the mean of its divisors is an integer number (311189632).

Almost surely, 2^1243102513 is an apocalyptic number.

It is an amenable number.

1243102513 is a deficient number, since it is larger than the sum of its proper divisors (1656015).

1243102513 is an equidigital number, since it uses as much as digits as its factorization.

1243102513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656014.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1243102513 is about 35257.6589268204. The cubic root of 1243102513 is about 1075.2323313961.

Adding to 1243102513 its reverse (3152013421), we get a palindrome (4395115934).

The spelling of 1243102513 in words is "one billion, two hundred forty-three million, one hundred two thousand, five hundred thirteen".