123115155 has 16 divisors (see below), whose sum is σ = 207352320. Its totient is φ = 62205408.

The previous prime is 123115147. The next prime is 123115171. The reversal of 123115155 is 551511321.

It is not a de Polignac number, because 123115155 - 2³ = 123115147 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215707 + ... + 216276.

It is an arithmetic number, because the mean of its divisors is an integer number (12959520).

Almost surely, 2^123115155 is an apocalyptic number.

123115155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123115155 is a deficient number, since it is larger than the sum of its proper divisors (84237165).

123115155 is a wasteful number, since it uses less digits than its factorization.

123115155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432010.

The product of its digits is 750, while the sum is 24.

The square root of 123115155 is about 11095.7268802003. The cubic root of 123115155 is about 497.4741348303.

Adding to 123115155 its reverse (551511321), we get a palindrome (674626476).

The spelling of 123115155 in words is "one hundred twenty-three million, one hundred fifteen thousand, one hundred fifty-five".