31133131320231 has 12 divisors (see below), whose sum is σ = 45707292977320. Its totient is φ = 20415168078480.

The previous prime is 31133131320173. The next prime is 31133131320233. The reversal of 31133131320231 is 13202313133113.

31133131320231 is a `hidden beast` number, since 3 + 1 + 1 + 3 + 313 + 1 + 320 + 23 + 1 = 666.

It is not a de Polignac number, because 31133131320231 - 2¹³ = 31133131312039 is a prime.

It is a super-2 number, since 2×31133131320231² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31133131320195 and 31133131320204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31133131320233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28354399561 + ... + 28354400658.

Almost surely, 2^{31133131320231} is an apocalyptic number.

31133131320231 is a deficient number, since it is larger than the sum of its proper divisors (14574161657089).

31133131320231 is a wasteful number, since it uses less digits than its factorization.

31133131320231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56708800286 (or 56708800283 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

Adding to 31133131320231 its reverse (13202313133113), we get a palindrome (44335444453344).

The spelling of 31133131320231 in words is "thirty-one trillion, one hundred thirty-three billion, one hundred thirty-one million, three hundred twenty thousand, two hundred thirty-one".