23217709 has 2 divisors, whose sum is σ = 23217710. Its totient is φ = 23217708.

The previous prime is 23217683. The next prime is 23217713. The reversal of 23217709 is 90771232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21883684 + 1334025 = 4678^2 + 1155^2 .

It is a cyclic number.

It is not a de Polignac number, because 23217709 - 2¹³ = 23209517 is a prime.

It is a super-2 number, since 2×23217709² = 1078124022417362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23217749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11608854 + 11608855.

It is an arithmetic number, because the mean of its divisors is an integer number (11608855).

Almost surely, 2^23217709 is an apocalyptic number.

It is an amenable number.

23217709 is a deficient number, since it is larger than the sum of its proper divisors (1).

23217709 is an equidigital number, since it uses as much as digits as its factorization.

23217709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 23217709 is about 4818.4757963489. The cubic root of 23217709 is about 285.2811793574.

The spelling of 23217709 in words is "twenty-three million, two hundred seventeen thousand, seven hundred nine".