22646381 has 2 divisors, whose sum is σ = 22646382. Its totient is φ = 22646380.

The previous prime is 22646359. The next prime is 22646401. The reversal of 22646381 is 18364622.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18062500 + 4583881 = 4250^2 + 2141^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22646381 is a prime.

It is a super-2 number, since 2×22646381² = 1025717144794322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22646341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11323190 + 11323191.

It is an arithmetic number, because the mean of its divisors is an integer number (11323191).

Almost surely, 2^22646381 is an apocalyptic number.

It is an amenable number.

22646381 is a deficient number, since it is larger than the sum of its proper divisors (1).

22646381 is an equidigital number, since it uses as much as digits as its factorization.

22646381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 32.

The square root of 22646381 is about 4758.8213876967. The cubic root of 22646381 is about 282.9217070854.

The spelling of 22646381 in words is "twenty-two million, six hundred forty-six thousand, three hundred eighty-one".