12123961 has 4 divisors (see below), whose sum is σ = 12235300. Its totient is φ = 12012624.

The previous prime is 12123959. The next prime is 12123977. The reversal of 12123961 is 16932121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16932121 = 1217 ⋅13913.

It can be written as a sum of positive squares in 2 ways, for example, as 7458361 + 4665600 = 2731^2 + 2160^2 .

It is a cyclic number.

It is not a de Polignac number, because 12123961 - 2¹ = 12123959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12123361) 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, 55506 + ... + 55723.

It is an arithmetic number, because the mean of its divisors is an integer number (3058825).

Almost surely, 2^12123961 is an apocalyptic number.

It is an amenable number.

12123961 is a deficient number, since it is larger than the sum of its proper divisors (111339).

12123961 is a wasteful number, since it uses less digits than its factorization.

12123961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111338.

The product of its digits is 648, while the sum is 25.

The square root of 12123961 is about 3481.9478743944. The cubic root of 12123961 is about 229.7284823690.

The spelling of 12123961 in words is "twelve million, one hundred twenty-three thousand, nine hundred sixty-one".