22718789 has 2 divisors, whose sum is σ = 22718790. Its totient is φ = 22718788.

The previous prime is 22718771. The next prime is 22718791. The reversal of 22718789 is 98781722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19070689 + 3648100 = 4367^2 + 1910^2 .

It is a cyclic number.

It is not a de Polignac number, because 22718789 - 2²⁰ = 21670213 is a prime.

It is a super-2 number, since 2×22718789² = 1032286747253042, which contains 22 as substring.

Together with 22718791, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22718389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11359394 + 11359395.

It is an arithmetic number, because the mean of its divisors is an integer number (11359395).

Almost surely, 2^22718789 is an apocalyptic number.

It is an amenable number.

22718789 is a deficient number, since it is larger than the sum of its proper divisors (1).

22718789 is an equidigital number, since it uses as much as digits as its factorization.

22718789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 44.

The square root of 22718789 is about 4766.4230823543. The cubic root of 22718789 is about 283.2229178377. Note that the first 3 decimals are identical.

The spelling of 22718789 in words is "twenty-two million, seven hundred eighteen thousand, seven hundred eighty-nine".