22318643 has 2 divisors, whose sum is σ = 22318644. Its totient is φ = 22318642.

The previous prime is 22318607. The next prime is 22318657. The reversal of 22318643 is 34681322.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22318643 - 2¹⁰ = 22317619 is a prime.

It is a super-3 number, since 3×22318643³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22318663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11159321 + 11159322.

It is an arithmetic number, because the mean of its divisors is an integer number (11159322).

Almost surely, 2^22318643 is an apocalyptic number.

22318643 is a deficient number, since it is larger than the sum of its proper divisors (1).

22318643 is an equidigital number, since it uses as much as digits as its factorization.

22318643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 29.

The square root of 22318643 is about 4724.2611062472. The cubic root of 22318643 is about 281.5502572464.

Adding to 22318643 its reverse (34681322), we get a palindrome (56999965).

The spelling of 22318643 in words is "twenty-two million, three hundred eighteen thousand, six hundred forty-three".