31303311231 has 4 divisors (see below), whose sum is σ = 41737748312. Its totient is φ = 20868874152.

The previous prime is 31303311209. The next prime is 31303311287. The reversal of 31303311231 is 13211330313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13211330313 = 3 ⋅4403776771.

It is not a de Polignac number, because 31303311231 - 2³¹ = 29155827583 is a prime.

It is a super-2 number, since 2×31303311231² (a number of 22 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 = 31303311198 and 31303311207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31303313231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5217218536 + ... + 5217218541.

It is an arithmetic number, because the mean of its divisors is an integer number (10434437078).

Almost surely, 2^31303311231 is an apocalyptic number.

31303311231 is a deficient number, since it is larger than the sum of its proper divisors (10434437081).

31303311231 is a wasteful number, since it uses less digits than its factorization.

31303311231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10434437080.

The product of its (nonzero) digits is 486, while the sum is 21.

Adding to 31303311231 its reverse (13211330313), we get a palindrome (44514641544).

The spelling of 31303311231 in words is "thirty-one billion, three hundred three million, three hundred eleven thousand, two hundred thirty-one".