23391089 has 2 divisors, whose sum is σ = 23391090. Its totient is φ = 23391088.

The previous prime is 23391079. The next prime is 23391091. The reversal of 23391089 is 98019332.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17181025 + 6210064 = 4145^2 + 2492^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23391089 is a prime.

It is a Sophie Germain prime.

Together with 23391091, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (23391079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11695544 + 11695545.

It is an arithmetic number, because the mean of its divisors is an integer number (11695545).

Almost surely, 2^23391089 is an apocalyptic number.

It is an amenable number.

23391089 is a deficient number, since it is larger than the sum of its proper divisors (1).

23391089 is an equidigital number, since it uses as much as digits as its factorization.

23391089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 23391089 is about 4836.4335000080. The cubic root of 23391089 is about 285.9895386331.

The spelling of 23391089 in words is "twenty-three million, three hundred ninety-one thousand, eighty-nine".