31311012102231 has 4 divisors (see below), whose sum is σ = 41748016136312. Its totient is φ = 20874008068152.

The previous prime is 31311012102217. The next prime is 31311012102259. The reversal of 31311012102231 is 13220121011313.

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

It is not a de Polignac number, because 31311012102231 - 2⁷ = 31311012102103 is a prime.

It is a super-2 number, since 2×31311012102231² (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 = 31311012102198 and 31311012102207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311012102431) 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, 5218502017036 + ... + 5218502017041.

It is an arithmetic number, because the mean of its divisors is an integer number (10437004034078).

Almost surely, 2^{31311012102231} is an apocalyptic number.

31311012102231 is a deficient number, since it is larger than the sum of its proper divisors (10437004034081).

31311012102231 is a wasteful number, since it uses less digits than its factorization.

31311012102231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10437004034080.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 31311012102231 its reverse (13220121011313), we get a palindrome (44531133113544).

The spelling of 31311012102231 in words is "thirty-one trillion, three hundred eleven billion, twelve million, one hundred two thousand, two hundred thirty-one".