123569 has 4 divisors (see below), whose sum is σ = 127860. Its totient is φ = 119280.

The previous prime is 123553. The next prime is 123581. The reversal of 123569 is 965321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 97969 + 25600 = 313^2 + 160^2 .

It is a cyclic number.

It is not a de Polignac number, because 123569 - 2⁴ = 123553 is a prime.

It is a super-2 number, since 2×123569² = 30538595522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (123169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2102 + ... + 2159.

It is an arithmetic number, because the mean of its divisors is an integer number (31965).

2¹²³⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

123569 is a deficient number, since it is larger than the sum of its proper divisors (4291).

123569 is an equidigital number, since it uses as much as digits as its factorization.

123569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4290.

The product of its digits is 1620, while the sum is 26.

The square root of 123569 is about 351.5238256506. The cubic root of 123569 is about 49.8084672409.

The spelling of 123569 in words is "one hundred twenty-three thousand, five hundred sixty-nine".