31244131613 has 4 divisors (see below), whose sum is σ = 31261481628. Its totient is φ = 31226781600.

The previous prime is 31244131591. The next prime is 31244131637. The reversal of 31244131613 is 31613144213.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11193005209 + 20051126404 = 105797^2 + 141602^2 .

It is a cyclic number.

It is not a de Polignac number, because 31244131613 - 2⁸ = 31244131357 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 (31244131693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8672306 + ... + 8675907.

It is an arithmetic number, because the mean of its divisors is an integer number (7815370407).

Almost surely, 2^31244131613 is an apocalyptic number.

It is an amenable number.

31244131613 is a deficient number, since it is larger than the sum of its proper divisors (17350015).

31244131613 is a wasteful number, since it uses less digits than its factorization.

31244131613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17350014.

The product of its digits is 5184, while the sum is 29.

Adding to 31244131613 its reverse (31613144213), we get a palindrome (62857275826).

The spelling of 31244131613 in words is "thirty-one billion, two hundred forty-four million, one hundred thirty-one thousand, six hundred thirteen".