1313503445 has 4 divisors (see below), whose sum is σ = 1576204140. Its totient is φ = 1050802752.

The previous prime is 1313503439. The next prime is 1313503447. The reversal of 1313503445 is 5443053131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5443053131 = 2741 ⋅1985791.

It can be written as a sum of positive squares in 2 ways, for example, as 273505444 + 1039998001 = 16538^2 + 32249^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313503445 - 2⁸ = 1313503189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313503447) 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, 131350340 + ... + 131350349.

It is an arithmetic number, because the mean of its divisors is an integer number (394051035).

Almost surely, 2^1313503445 is an apocalyptic number.

It is an amenable number.

1313503445 is a deficient number, since it is larger than the sum of its proper divisors (262700695).

1313503445 is an equidigital number, since it uses as much as digits as its factorization.

1313503445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262700694.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 1313503445 is about 36242.2880762239. The cubic root of 1313503445 is about 1095.1587365354.

Adding to 1313503445 its reverse (5443053131), we get a palindrome (6756556576).

The spelling of 1313503445 in words is "one billion, three hundred thirteen million, five hundred three thousand, four hundred forty-five".