31444330013 has 4 divisors (see below), whose sum is σ = 31469916540. Its totient is φ = 31418743488.

The previous prime is 31444329979. The next prime is 31444330033. The reversal of 31444330013 is 31003344413.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31003344413 = 149 ⋅208076137.

It can be written as a sum of positive squares in 2 ways, for example, as 19567253689 + 11877076324 = 139883^2 + 108982^2 .

It is a cyclic number.

It is not a de Polignac number, because 31444330013 - 2¹⁸ = 31444067869 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 (31444330033) 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, 12791420 + ... + 12793877.

It is an arithmetic number, because the mean of its divisors is an integer number (7867479135).

Almost surely, 2^31444330013 is an apocalyptic number.

It is an amenable number.

31444330013 is a deficient number, since it is larger than the sum of its proper divisors (25586527).

31444330013 is a wasteful number, since it uses less digits than its factorization.

31444330013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25586526.

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 31444330013 its reverse (31003344413), we get a palindrome (62447674426).

The spelling of 31444330013 in words is "thirty-one billion, four hundred forty-four million, three hundred thirty thousand, thirteen".