123553155 has 16 divisors (see below), whose sum is σ = 215656704. Its totient is φ = 59904480.

The previous prime is 123553109. The next prime is 123553163. The reversal of 123553155 is 551355321.

It is not a de Polignac number, because 123553155 - 2⁶ = 123553091 is a prime.

It is a super-2 number, since 2×123553155² = 30530764220908050, which contains 22 as substring.

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, 374239 + ... + 374568.

It is an arithmetic number, because the mean of its divisors is an integer number (13478544).

Almost surely, 2^123553155 is an apocalyptic number.

123553155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123553155 is a deficient number, since it is larger than the sum of its proper divisors (92103549).

123553155 is a wasteful number, since it uses less digits than its factorization.

123553155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748826.

The product of its digits is 11250, while the sum is 30.

The square root of 123553155 is about 11115.4466846816. The cubic root of 123553155 is about 498.0633820394.

The spelling of 123553155 in words is "one hundred twenty-three million, five hundred fifty-three thousand, one hundred fifty-five".