23405281 has 2 divisors, whose sum is σ = 23405282. Its totient is φ = 23405280.

The previous prime is 23405257. The next prime is 23405293. The reversal of 23405281 is 18250432.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16329681 + 7075600 = 4041^2 + 2660^2 .

It is a cyclic number.

It is not a de Polignac number, because 23405281 - 2⁷ = 23405153 is a prime.

It is a super-2 number, since 2×23405281² = 1095614357377922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23406281) 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 as a sum of consecutive naturals, namely, 11702640 + 11702641.

It is an arithmetic number, because the mean of its divisors is an integer number (11702641).

Almost surely, 2^23405281 is an apocalyptic number.

It is an amenable number.

23405281 is a deficient number, since it is larger than the sum of its proper divisors (1).

23405281 is an equidigital number, since it uses as much as digits as its factorization.

23405281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 23405281 is about 4837.9004743794. The cubic root of 23405281 is about 286.0473661097.

The spelling of 23405281 in words is "twenty-three million, four hundred five thousand, two hundred eighty-one".