123121623 has 16 divisors (see below), whose sum is σ = 168016896. Its totient is φ = 80161440.

The previous prime is 123121601. The next prime is 123121631. The reversal of 123121623 is 326121321.

It is not a de Polignac number, because 123121623 - 2⁹ = 123121111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123121623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123121643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115513 + ... + 116573.

It is an arithmetic number, because the mean of its divisors is an integer number (10501056).

Almost surely, 2^123121623 is an apocalyptic number.

123121623 is a deficient number, since it is larger than the sum of its proper divisors (44895273).

123121623 is a wasteful number, since it uses less digits than its factorization.

123121623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1934.

The product of its digits is 432, while the sum is 21.

The square root of 123121623 is about 11096.0183399272. The cubic root of 123121623 is about 497.4828464747.

Adding to 123121623 its reverse (326121321), we get a palindrome (449242944).

The spelling of 123121623 in words is "one hundred twenty-three million, one hundred twenty-one thousand, six hundred twenty-three".