123172169 has 2 divisors, whose sum is σ = 123172170. Its totient is φ = 123172168.

The previous prime is 123172151. The next prime is 123172171. The reversal of 123172169 is 961271321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122766400 + 405769 = 11080^2 + 637^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123172169 is a prime.

It is a super-2 number, since 2×123172169² = 30342766432329122, which contains 22 as substring.

Together with 123172171, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123172069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61586084 + 61586085.

It is an arithmetic number, because the mean of its divisors is an integer number (61586085).

Almost surely, 2^123172169 is an apocalyptic number.

It is an amenable number.

123172169 is a deficient number, since it is larger than the sum of its proper divisors (1).

123172169 is an equidigital number, since it uses as much as digits as its factorization.

123172169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 32.

The square root of 123172169 is about 11098.2957700721. The cubic root of 123172169 is about 497.5509155570.

The spelling of 123172169 in words is "one hundred twenty-three million, one hundred seventy-two thousand, one hundred sixty-nine".