123181530 has 32 divisors (see below), whose sum is σ = 296512704. Its totient is φ = 32750976.

The previous prime is 123181529. The next prime is 123181543. The reversal of 123181530 is 35181321.

It is a self number, because there is not a number n which added to its sum of digits gives 123181530.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4494 + ... + 16326.

It is an arithmetic number, because the mean of its divisors is an integer number (9266022).

Almost surely, 2^123181530 is an apocalyptic number.

123181530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123181530 is an abundant number, since it is smaller than the sum of its proper divisors (173331174).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123181530 is a wasteful number, since it uses less digits than its factorization.

123181530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12190.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 123181530 is about 11098.7174934764. The cubic root of 123181530 is about 497.5635197466.

The spelling of 123181530 in words is "one hundred twenty-three million, one hundred eighty-one thousand, five hundred thirty".