123131122171 has 2 divisors, whose sum is σ = 123131122172. Its totient is φ = 123131122170.

The previous prime is 123131122159. The next prime is 123131122189. The reversal of 123131122171 is 171221131321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123131122171 - 2¹³ = 123131113979 is a prime.

It is a super-2 number, since 2×123131122171² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123131132171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61565561085 + 61565561086.

It is an arithmetic number, because the mean of its divisors is an integer number (61565561086).

Almost surely, 2^123131122171 is an apocalyptic number.

123131122171 is a deficient number, since it is larger than the sum of its proper divisors (1).

123131122171 is an equidigital number, since it uses as much as digits as its factorization.

123131122171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 25.

Adding to 123131122171 its reverse (171221131321), we get a palindrome (294352253492).

The spelling of 123131122171 in words is "one hundred twenty-three billion, one hundred thirty-one million, one hundred twenty-two thousand, one hundred seventy-one".