123521623 has 4 divisors (see below), whose sum is σ = 123666280. Its totient is φ = 123376968.

The previous prime is 123521599. The next prime is 123521627. The reversal of 123521623 is 326125321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123521623 - 2¹⁷ = 123390551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123521627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71040 + ... + 72757.

It is an arithmetic number, because the mean of its divisors is an integer number (30916570).

Almost surely, 2^123521623 is an apocalyptic number.

123521623 is a deficient number, since it is larger than the sum of its proper divisors (144657).

123521623 is an equidigital number, since it uses as much as digits as its factorization.

123521623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144656.

The product of its digits is 2160, while the sum is 25.

The square root of 123521623 is about 11114.0282076302. The cubic root of 123521623 is about 498.0210081835.

Adding to 123521623 its reverse (326125321), we get a palindrome (449646944).

The spelling of 123521623 in words is "one hundred twenty-three million, five hundred twenty-one thousand, six hundred twenty-three".