123663121 has 2 divisors, whose sum is σ = 123663122. Its totient is φ = 123663120.

The previous prime is 123663107. The next prime is 123663143. The reversal of 123663121 is 121366321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105267600 + 18395521 = 10260^2 + 4289^2 .

It is a cyclic number.

It is not a de Polignac number, because 123663121 - 2⁷ = 123662993 is a prime.

It is not a weakly prime, because it can be changed into another prime (123661121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61831560 + 61831561.

It is an arithmetic number, because the mean of its divisors is an integer number (61831561).

Almost surely, 2^123663121 is an apocalyptic number.

It is an amenable number.

123663121 is a deficient number, since it is larger than the sum of its proper divisors (1).

123663121 is an equidigital number, since it uses as much as digits as its factorization.

123663121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 25.

The square root of 123663121 is about 11120.3921243812. The cubic root of 123663121 is about 498.2111019875.

The spelling of 123663121 in words is "one hundred twenty-three million, six hundred sixty-three thousand, one hundred twenty-one".