23123281 has 4 divisors (see below), whose sum is σ = 24483492. Its totient is φ = 21763072.

The previous prime is 23123273. The next prime is 23123311. The reversal of 23123281 is 18232132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10342656 + 12780625 = 3216^2 + 3575^2 .

It is a cyclic number.

It is not a de Polignac number, because 23123281 - 2³ = 23123273 is a prime.

It is a super-2 number, since 2×23123281² = 1069372248409922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23123231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 680080 + ... + 680113.

It is an arithmetic number, because the mean of its divisors is an integer number (6120873).

Almost surely, 2^23123281 is an apocalyptic number.

It is an amenable number.

23123281 is a deficient number, since it is larger than the sum of its proper divisors (1360211).

23123281 is a wasteful number, since it uses less digits than its factorization.

23123281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360210.

The product of its digits is 576, while the sum is 22.

The square root of 23123281 is about 4808.6672789870. The cubic root of 23123281 is about 284.8939012065.

The spelling of 23123281 in words is "twenty-three million, one hundred twenty-three thousand, two hundred eighty-one".