23287189 has 2 divisors, whose sum is σ = 23287190. Its totient is φ = 23287188.

The previous prime is 23287163. The next prime is 23287211. The reversal of 23287189 is 98178232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21464689 + 1822500 = 4633^2 + 1350^2 .

It is a cyclic number.

It is not a de Polignac number, because 23287189 - 2⁵ = 23287157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23287129) 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, 11643594 + 11643595.

It is an arithmetic number, because the mean of its divisors is an integer number (11643595).

Almost surely, 2^23287189 is an apocalyptic number.

It is an amenable number.

23287189 is a deficient number, since it is larger than the sum of its proper divisors (1).

23287189 is an equidigital number, since it uses as much as digits as its factorization.

23287189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 23287189 is about 4825.6801593143. The cubic root of 23287189 is about 285.5654680596.

The spelling of 23287189 in words is "twenty-three million, two hundred eighty-seven thousand, one hundred eighty-nine".