1310203205 has 4 divisors (see below), whose sum is σ = 1572243852. Its totient is φ = 1048162560.

The previous prime is 1310203187. The next prime is 1310203207. The reversal of 1310203205 is 5023020131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5023020131 = 877 ⋅5727503.

It can be written as a sum of positive squares in 2 ways, for example, as 912160804 + 398042401 = 30202^2 + 19951^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1310203205 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1310203207) 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, 131020316 + ... + 131020325.

It is an arithmetic number, because the mean of its divisors is an integer number (393060963).

Almost surely, 2^1310203205 is an apocalyptic number.

It is an amenable number.

1310203205 is a deficient number, since it is larger than the sum of its proper divisors (262040647).

1310203205 is an equidigital number, since it uses as much as digits as its factorization.

1310203205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262040646.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 1310203205 is about 36196.7292030647. The cubic root of 1310203205 is about 1094.2407544427.

Adding to 1310203205 its reverse (5023020131), we get a palindrome (6333223336).

The spelling of 1310203205 in words is "one billion, three hundred ten million, two hundred three thousand, two hundred five".