31123213110163 has 2 divisors, whose sum is σ = 31123213110164. Its totient is φ = 31123213110162.

The previous prime is 31123213110139. The next prime is 31123213110257. The reversal of 31123213110163 is 36101131232113.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31123213110163 is a prime.

It is not a weakly prime, because it can be changed into another prime (31123213113163) 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 as a sum of consecutive naturals, namely, 15561606555081 + 15561606555082.

It is an arithmetic number, because the mean of its divisors is an integer number (15561606555082).

Almost surely, 2^{31123213110163} is an apocalyptic number.

31123213110163 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123213110163 is an equidigital number, since it uses as much as digits as its factorization.

31123213110163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

Adding to 31123213110163 its reverse (36101131232113), we get a palindrome (67224344342276).

The spelling of 31123213110163 in words is "thirty-one trillion, one hundred twenty-three billion, two hundred thirteen million, one hundred ten thousand, one hundred sixty-three".