23218709 has 2 divisors, whose sum is σ = 23218710. Its totient is φ = 23218708.

The previous prime is 23218693. The next prime is 23218729. The reversal of 23218709 is 90781232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12096484 + 11122225 = 3478^2 + 3335^2 .

It is a cyclic number.

It is not a de Polignac number, because 23218709 - 2⁴ = 23218693 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23218729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11609354 + 11609355.

It is an arithmetic number, because the mean of its divisors is an integer number (11609355).

Almost surely, 2^23218709 is an apocalyptic number.

It is an amenable number.

23218709 is a deficient number, since it is larger than the sum of its proper divisors (1).

23218709 is an equidigital number, since it uses as much as digits as its factorization.

23218709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 23218709 is about 4818.5795624852. The cubic root of 23218709 is about 285.2852750397.

The spelling of 23218709 in words is "twenty-three million, two hundred eighteen thousand, seven hundred nine".