23551109 has 2 divisors, whose sum is σ = 23551110. Its totient is φ = 23551108.

The previous prime is 23551081. The next prime is 23551111. The reversal of 23551109 is 90115532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21996100 + 1555009 = 4690^2 + 1247^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23551109 is a prime.

It is a Sophie Germain prime.

Together with 23551111, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23551159) 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, 11775554 + 11775555.

It is an arithmetic number, because the mean of its divisors is an integer number (11775555).

Almost surely, 2^23551109 is an apocalyptic number.

It is an amenable number.

23551109 is a deficient number, since it is larger than the sum of its proper divisors (1).

23551109 is an equidigital number, since it uses as much as digits as its factorization.

23551109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 23551109 is about 4852.9484851995. The cubic root of 23551109 is about 286.6402149441.

The spelling of 23551109 in words is "twenty-three million, five hundred fifty-one thousand, one hundred nine".