31312210001123 has 2 divisors, whose sum is σ = 31312210001124. Its totient is φ = 31312210001122.

The previous prime is 31312210001119. The next prime is 31312210001143. The reversal of 31312210001123 is 32110001221313.

It is a happy number.

It is an a-pointer prime, because the next prime (31312210001143) can be obtained adding 31312210001123 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31312210001123 - 2² = 31312210001119 is a prime.

It is a super-2 number, since 2×31312210001123² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31312210001095 and 31312210001104.

It is not a weakly prime, because it can be changed into another prime (31312210001143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656105000561 + 15656105000562.

It is an arithmetic number, because the mean of its divisors is an integer number (15656105000562).

Almost surely, 2^{31312210001123} is an apocalyptic number.

31312210001123 is a deficient number, since it is larger than the sum of its proper divisors (1).

31312210001123 is an equidigital number, since it uses as much as digits as its factorization.

31312210001123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 31312210001123 its reverse (32110001221313), we get a palindrome (63422211222436).

The spelling of 31312210001123 in words is "thirty-one trillion, three hundred twelve billion, two hundred ten million, one thousand, one hundred twenty-three".