1331323013 has 8 divisors (see below), whose sum is σ = 1365204120. Its totient is φ = 1297509120.

The previous prime is 1331322991. The next prime is 1331323033. The reversal of 1331323013 is 3103231331.

It can be written as a sum of positive squares in 4 ways, for example, as 465610084 + 865712929 = 21578^2 + 29423^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1331323013 - 2²⁸ = 1062887557 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 (1331323033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24593 + ... + 57161.

It is an arithmetic number, because the mean of its divisors is an integer number (170650515).

Almost surely, 2^1331323013 is an apocalyptic number.

It is an amenable number.

1331323013 is a deficient number, since it is larger than the sum of its proper divisors (33881107).

1331323013 is an equidigital number, since it uses as much as digits as its factorization.

1331323013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33607.

The product of its (nonzero) digits is 486, while the sum is 20.

The square root of 1331323013 is about 36487.2993382629. The cubic root of 1331323013 is about 1100.0889771001.

Adding to 1331323013 its reverse (3103231331), we get a palindrome (4434554344).

The spelling of 1331323013 in words is "one billion, three hundred thirty-one million, three hundred twenty-three thousand, thirteen".