6631312013 has 16 divisors (see below), whose sum is σ = 6934923696. Its totient is φ = 6334640640.

The previous prime is 6631312007. The next prime is 6631312067. The reversal of 6631312013 is 3102131366.

It can be written as a sum of positive squares in 8 ways, for example, as 358988809 + 6272323204 = 18947^2 + 79198^2 .

It is a cyclic number.

It is not a de Polignac number, because 6631312013 - 2⁶ = 6631311949 is a prime.

It is a super-2 number, since 2×6631312013² = 87948598027516224338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6631312003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1381145 + ... + 1385937.

It is an arithmetic number, because the mean of its divisors is an integer number (433432731).

Almost surely, 2^6631312013 is an apocalyptic number.

It is an amenable number.

6631312013 is a deficient number, since it is larger than the sum of its proper divisors (303611683).

6631312013 is a wasteful number, since it uses less digits than its factorization.

6631312013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5504.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 6631312013 is about 81432.8681368893. The cubic root of 6631312013 is about 1878.7391588371.

Adding to 6631312013 its reverse (3102131366), we get a palindrome (9733443379).

The spelling of 6631312013 in words is "six billion, six hundred thirty-one million, three hundred twelve thousand, thirteen".