123102181 has 2 divisors, whose sum is σ = 123102182. Its totient is φ = 123102180.

The previous prime is 123102179. The next prime is 123102193. The reversal of 123102181 is 181201321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66341025 + 56761156 = 8145^2 + 7534^2 .

It is a cyclic number.

It is not a de Polignac number, because 123102181 - 2¹ = 123102179 is a prime.

It is a super-4 number, since 4×123102181⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

Together with 123102179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123102481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61551090 + 61551091.

It is an arithmetic number, because the mean of its divisors is an integer number (61551091).

Almost surely, 2^123102181 is an apocalyptic number.

It is an amenable number.

123102181 is a deficient number, since it is larger than the sum of its proper divisors (1).

123102181 is an equidigital number, since it uses as much as digits as its factorization.

123102181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 123102181 is about 11095.1422253164. The cubic root of 123102181 is about 497.4566594400.

The spelling of 123102181 in words is "one hundred twenty-three million, one hundred two thousand, one hundred eighty-one".