123165530 has 16 divisors (see below), whose sum is σ = 222545664. Its totient is φ = 49077840.

The previous prime is 123165499. The next prime is 123165533. The reversal of 123165530 is 35561321.

It is a self number, because there is not a number n which added to its sum of digits gives 123165530.

It is not an unprimeable number, because it can be changed into a prime (123165533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20786 + ... + 26045.

It is an arithmetic number, because the mean of its divisors is an integer number (13909104).

Almost surely, 2^123165530 is an apocalyptic number.

123165530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123165530 is a deficient number, since it is larger than the sum of its proper divisors (99380134).

123165530 is a wasteful number, since it uses less digits than its factorization.

123165530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47101.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 123165530 is about 11097.9966660655. The cubic root of 123165530 is about 497.5419760379.

The spelling of 123165530 in words is "one hundred twenty-three million, one hundred sixty-five thousand, five hundred thirty".