123243181 has 2 divisors, whose sum is σ = 123243182. Its totient is φ = 123243180.

The previous prime is 123243173. The next prime is 123243187. The reversal of 123243181 is 181342321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120890025 + 2353156 = 10995^2 + 1534^2 .

It is an emirp because it is prime and its reverse (181342321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123243181 - 2³ = 123243173 is a prime.

It is a super-2 number, since 2×123243181² = 30377763325997522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123243187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61621590 + 61621591.

It is an arithmetic number, because the mean of its divisors is an integer number (61621591).

Almost surely, 2^123243181 is an apocalyptic number.

It is an amenable number.

123243181 is a deficient number, since it is larger than the sum of its proper divisors (1).

123243181 is an equidigital number, since it uses as much as digits as its factorization.

123243181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

The square root of 123243181 is about 11101.4945390249. The cubic root of 123243181 is about 497.6465142573.

The spelling of 123243181 in words is "one hundred twenty-three million, two hundred forty-three thousand, one hundred eighty-one".