23205709 has 2 divisors, whose sum is σ = 23205710. Its totient is φ = 23205708.

The previous prime is 23205671. The next prime is 23205719. The reversal of 23205709 is 90750232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23068809 + 136900 = 4803^2 + 370^2 .

It is a cyclic number.

It is not a de Polignac number, because 23205709 - 2¹⁷ = 23074637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23205719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11602854 + 11602855.

It is an arithmetic number, because the mean of its divisors is an integer number (11602855).

Almost surely, 2^23205709 is an apocalyptic number.

It is an amenable number.

23205709 is a deficient number, since it is larger than the sum of its proper divisors (1).

23205709 is an equidigital number, since it uses as much as digits as its factorization.

23205709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 23205709 is about 4817.2304283686. The cubic root of 23205709 is about 285.2320219935.

The spelling of 23205709 in words is "twenty-three million, two hundred five thousand, seven hundred nine".