1313020243 has 4 divisors (see below), whose sum is σ = 1328839848. Its totient is φ = 1297200640.

The previous prime is 1313020231. The next prime is 1313020307. The reversal of 1313020243 is 3420203131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3420203131 = 29 ⋅117938039.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1313020243 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 1313020243.

It is not an unprimeable number, because it can be changed into a prime (1313020223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7909678 + ... + 7909843.

It is an arithmetic number, because the mean of its divisors is an integer number (332209962).

Almost surely, 2^1313020243 is an apocalyptic number.

1313020243 is a deficient number, since it is larger than the sum of its proper divisors (15819605).

1313020243 is an equidigital number, since it uses as much as digits as its factorization.

1313020243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15819604.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1313020243 is about 36235.6211896526. The cubic root of 1313020243 is about 1095.0244270803.

Adding to 1313020243 its reverse (3420203131), we get a palindrome (4733223374).

The spelling of 1313020243 in words is "one billion, three hundred thirteen million, twenty thousand, two hundred forty-three".