23209061 has 2 divisors, whose sum is σ = 23209062. Its totient is φ = 23209060.

The previous prime is 23209057. The next prime is 23209073. The reversal of 23209061 is 16090232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19088161 + 4120900 = 4369^2 + 2030^2 .

It is a cyclic number.

It is not a de Polignac number, because 23209061 - 2² = 23209057 is a prime.

It is a Sophie Germain prime.

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 (23209031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11604530 + 11604531.

It is an arithmetic number, because the mean of its divisors is an integer number (11604531).

Almost surely, 2^23209061 is an apocalyptic number.

It is an amenable number.

23209061 is a deficient number, since it is larger than the sum of its proper divisors (1).

23209061 is an equidigital number, since it uses as much as digits as its factorization.

23209061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 23209061 is about 4817.5783335614. The cubic root of 23209061 is about 285.2457549892.

Adding to 23209061 its reverse (16090232), we get a palindrome (39299293).

The spelling of 23209061 in words is "twenty-three million, two hundred nine thousand, sixty-one".