123233996209 has 3 divisors (see below), whose sum is σ = 123234347257. Its totient is φ = 123233645162.

The previous prime is 123233996203. The next prime is 123233996233. The reversal of 123233996209 is 902699332321.

It is a happy number.

The square root of 123233996209 is 351047.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 902699332321 = 67 ⋅13473124363.

It is not a de Polignac number, because 123233996209 - 2³ = 123233996201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123233996201) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 175524 + ... + 526570.

Almost surely, 2^123233996209 is an apocalyptic number.

123233996209 is the 351047-th square number.

123233996209 is the 175524-th centered octagonal number.

It is an amenable number.

123233996209 is a deficient number, since it is larger than the sum of its proper divisors (351048).

123233996209 is an frugal number, since it uses more digits than its factorization.

123233996209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702094 (or 351047 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 49.

Multiplying 123233996209 by its sum of digits (49), we get a square (6038465814241 = 2457329²).

The spelling of 123233996209 in words is "one hundred twenty-three billion, two hundred thirty-three million, nine hundred ninety-six thousand, two hundred nine".