23581009 has 2 divisors, whose sum is σ = 23581010. Its totient is φ = 23581008.

The previous prime is 23581007. The next prime is 23581021. The reversal of 23581009 is 90018532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20930625 + 2650384 = 4575^2 + 1628^2 .

It is a cyclic number.

It is not a de Polignac number, because 23581009 - 2¹ = 23581007 is a prime.

Together with 23581007, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23581007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11790504 + 11790505.

It is an arithmetic number, because the mean of its divisors is an integer number (11790505).

Almost surely, 2^23581009 is an apocalyptic number.

It is an amenable number.

23581009 is a deficient number, since it is larger than the sum of its proper divisors (1).

23581009 is an equidigital number, since it uses as much as digits as its factorization.

23581009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 23581009 is about 4856.0281094738. The cubic root of 23581009 is about 286.7614678044.

The spelling of 23581009 in words is "twenty-three million, five hundred eighty-one thousand, nine".