123666271 has 2 divisors, whose sum is σ = 123666272. Its totient is φ = 123666270.

The previous prime is 123666253. The next prime is 123666281. The reversal of 123666271 is 172666321.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (172666321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123666271 - 2¹¹ = 123664223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123666251) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61833135 + 61833136.

It is an arithmetic number, because the mean of its divisors is an integer number (61833136).

Almost surely, 2^123666271 is an apocalyptic number.

123666271 is a deficient number, since it is larger than the sum of its proper divisors (1).

123666271 is an equidigital number, since it uses as much as digits as its factorization.

123666271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 34.

The square root of 123666271 is about 11120.5337551756. The cubic root of 123666271 is about 498.2153321671.

Subtracting 123666271 from its reverse (172666321), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 123666271 in words is "one hundred twenty-three million, six hundred sixty-six thousand, two hundred seventy-one".