123745565 has 4 divisors (see below), whose sum is σ = 148494684. Its totient is φ = 98996448.

The previous prime is 123745561. The next prime is 123745571. The reversal of 123745565 is 565547321.

It is a happy number.

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 30758116 + 92987449 = 5546^2 + 9643^2 .

It is a cyclic number.

It is not a de Polignac number, because 123745565 - 2² = 123745561 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123745561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12374552 + ... + 12374561.

It is an arithmetic number, because the mean of its divisors is an integer number (37123671).

Almost surely, 2^123745565 is an apocalyptic number.

It is an amenable number.

123745565 is a deficient number, since it is larger than the sum of its proper divisors (24749119).

123745565 is an equidigital number, since it uses as much as digits as its factorization.

123745565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24749118.

The product of its digits is 126000, while the sum is 38.

The square root of 123745565 is about 11124.0983904315. The cubic root of 123745565 is about 498.3217935482.

The spelling of 123745565 in words is "one hundred twenty-three million, seven hundred forty-five thousand, five hundred sixty-five".