23201509 has 2 divisors, whose sum is σ = 23201510. Its totient is φ = 23201508.

The previous prime is 23201501. The next prime is 23201513. The reversal of 23201509 is 90510232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15484225 + 7717284 = 3935^2 + 2778^2 .

It is a cyclic number.

It is not a de Polignac number, because 23201509 - 2³ = 23201501 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23201509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23201501) 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, 11600754 + 11600755.

It is an arithmetic number, because the mean of its divisors is an integer number (11600755).

Almost surely, 2^23201509 is an apocalyptic number.

It is an amenable number.

23201509 is a deficient number, since it is larger than the sum of its proper divisors (1).

23201509 is an equidigital number, since it uses as much as digits as its factorization.

23201509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 23201509 is about 4816.7944735062. The cubic root of 23201509 is about 285.2148129125.

The spelling of 23201509 in words is "twenty-three million, two hundred one thousand, five hundred nine".