123550155 has 24 divisors (see below), whose sum is σ = 218198448. Its totient is φ = 64648896.

The previous prime is 123550139. The next prime is 123550157. The reversal of 123550155 is 551055321.

It is not a de Polignac number, because 123550155 - 2⁴ = 123550139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123550157) 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 23 ways as a sum of consecutive naturals, for example, 23517 + ... + 28286.

It is an arithmetic number, because the mean of its divisors is an integer number (9091602).

Almost surely, 2^123550155 is an apocalyptic number.

123550155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123550155 is a deficient number, since it is larger than the sum of its proper divisors (94648293).

123550155 is a wasteful number, since it uses less digits than its factorization.

123550155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51867 (or 51864 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 123550155 is about 11115.3117365191. The cubic root of 123550155 is about 498.0593508400.

The spelling of 123550155 in words is "one hundred twenty-three million, five hundred fifty thousand, one hundred fifty-five".