123543569 has 2 divisors, whose sum is σ = 123543570. Its totient is φ = 123543568.

The previous prime is 123543559. The next prime is 123543571. The reversal of 123543569 is 965345321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90630400 + 32913169 = 9520^2 + 5737^2 .

It is a cyclic number.

It is not a de Polignac number, because 123543569 - 2⁸ = 123543313 is a prime.

It is a super-2 number, since 2×123543569² = 30526026882515522, which contains 22 as substring.

Together with 123543571, 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 (123543559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61771784 + 61771785.

It is an arithmetic number, because the mean of its divisors is an integer number (61771785).

Almost surely, 2^123543569 is an apocalyptic number.

It is an amenable number.

123543569 is a deficient number, since it is larger than the sum of its proper divisors (1).

123543569 is an equidigital number, since it uses as much as digits as its factorization.

123543569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 38.

The square root of 123543569 is about 11115.0154745731. The cubic root of 123543569 is about 498.0505007845.

The spelling of 123543569 in words is "one hundred twenty-three million, five hundred forty-three thousand, five hundred sixty-nine".