123215065 has 8 divisors (see below), whose sum is σ = 156555720. Its totient is φ = 92773632.

The previous prime is 123215041. The next prime is 123215093. The reversal of 123215065 is 560512321.

It can be written as a sum of positive squares in 4 ways, for example, as 52301824 + 70913241 = 7232^2 + 8421^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123215065 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 724710 + ... + 724879.

It is an arithmetic number, because the mean of its divisors is an integer number (19569465).

Almost surely, 2^123215065 is an apocalyptic number.

It is an amenable number.

123215065 is a deficient number, since it is larger than the sum of its proper divisors (33340655).

123215065 is a wasteful number, since it uses less digits than its factorization.

123215065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449611.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 123215065 is about 11100.2281508084. The cubic root of 123215065 is about 497.6086679618.

Adding to 123215065 its reverse (560512321), we get a palindrome (683727386).

The spelling of 123215065 in words is "one hundred twenty-three million, two hundred fifteen thousand, sixty-five".