1313503261 has 12 divisors (see below), whose sum is σ = 1534306620. Its totient is φ = 1121178240.

The previous prime is 1313503189. The next prime is 1313503271. The reversal of 1313503261 is 1623053131.

It can be written as a sum of positive squares in 2 ways, for example, as 847159236 + 466344025 = 29106^2 + 21595^2 .

It is not a de Polignac number, because 1313503261 - 2¹¹ = 1313501213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313503271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43806 + ... + 67423.

It is an arithmetic number, because the mean of its divisors is an integer number (127858885).

Almost surely, 2^1313503261 is an apocalyptic number.

It is an amenable number.

1313503261 is a deficient number, since it is larger than the sum of its proper divisors (220803359).

1313503261 is a wasteful number, since it uses less digits than its factorization.

1313503261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111484 (or 111477 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 1313503261 is about 36242.2855377527. The cubic root of 1313503261 is about 1095.1586853975.

Adding to 1313503261 its reverse (1623053131), we get a palindrome (2936556392).

The spelling of 1313503261 in words is "one billion, three hundred thirteen million, five hundred three thousand, two hundred sixty-one".