123500155 has 16 divisors (see below), whose sum is σ = 157813920. Its totient is φ = 92457472.

The previous prime is 123500141. The next prime is 123500207. The reversal of 123500155 is 551005321.

It is a cyclic number.

It is not a de Polignac number, because 123500155 - 2²¹ = 121403003 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, 11157 + ... + 19273.

It is an arithmetic number, because the mean of its divisors is an integer number (9863370).

Almost surely, 2^123500155 is an apocalyptic number.

123500155 is a deficient number, since it is larger than the sum of its proper divisors (34313765).

123500155 is a wasteful number, since it uses less digits than its factorization.

123500155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8318.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 123500155 is about 11113.0623592239. The cubic root of 123500155 is about 497.9921545728.

Adding to 123500155 its reverse (551005321), we get a palindrome (674505476).

The spelling of 123500155 in words is "one hundred twenty-three million, five hundred thousand, one hundred fifty-five".