23426561 has 4 divisors (see below), whose sum is σ = 24804612. Its totient is φ = 22048512.

The previous prime is 23426549. The next prime is 23426569. The reversal of 23426561 is 16562432.

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 18113536 + 5313025 = 4256^2 + 2305^2 .

It is a cyclic number.

It is not a de Polignac number, because 23426561 - 2⁶ = 23426497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23426569) 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, 689000 + ... + 689033.

It is an arithmetic number, because the mean of its divisors is an integer number (6201153).

Almost surely, 2^23426561 is an apocalyptic number.

It is an amenable number.

23426561 is a deficient number, since it is larger than the sum of its proper divisors (1378051).

23426561 is a wasteful number, since it uses less digits than its factorization.

23426561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378050.

The product of its digits is 8640, while the sum is 29.

The square root of 23426561 is about 4840.0992758414. The cubic root of 23426561 is about 286.1340309397.

Adding to 23426561 its reverse (16562432), we get a palindrome (39988993).

The spelling of 23426561 in words is "twenty-three million, four hundred twenty-six thousand, five hundred sixty-one".