123321155 has 16 divisors (see below), whose sum is σ = 149713920. Its totient is φ = 97512672.

The previous prime is 123321127. The next prime is 123321161. The reversal of 123321155 is 551123321.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 123321155 - 2¹⁶ = 123255619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123321155.

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, 202862 + ... + 203468.

It is an arithmetic number, because the mean of its divisors is an integer number (9357120).

Almost surely, 2^123321155 is an apocalyptic number.

123321155 is a deficient number, since it is larger than the sum of its proper divisors (26392765).

123321155 is a wasteful number, since it uses less digits than its factorization.

123321155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018.

The product of its digits is 900, while the sum is 23.

The square root of 123321155 is about 11105.0058532177. The cubic root of 123321155 is about 497.7514431424.

Adding to 123321155 its reverse (551123321), we get a palindrome (674444476).

The spelling of 123321155 in words is "one hundred twenty-three million, three hundred twenty-one thousand, one hundred fifty-five".