31544231013 has 12 divisors (see below), whose sum is σ = 45577068940. Its totient is φ = 21023404416.

The previous prime is 31544230999. The next prime is 31544231021. The reversal of 31544231013 is 31013244513.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7679542689 + 23864688324 = 87633^2 + 154482^2 .

It is not a de Polignac number, because 31544231013 - 2¹³ = 31544222821 is a prime.

It is a super-2 number, since 2×31544231013² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31544231023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 473956 + ... + 536397.

Almost surely, 2^31544231013 is an apocalyptic number.

It is an amenable number.

31544231013 is a deficient number, since it is larger than the sum of its proper divisors (14032837927).

31544231013 is a wasteful number, since it uses less digits than its factorization.

31544231013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013828 (or 1013825 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 31544231013 its reverse (31013244513), we get a palindrome (62557475526).

The spelling of 31544231013 in words is "thirty-one billion, five hundred forty-four million, two hundred thirty-one thousand, thirteen".