22328261 has 2 divisors, whose sum is σ = 22328262. Its totient is φ = 22328260.

The previous prime is 22328227. The next prime is 22328263. The reversal of 22328261 is 16282322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21215236 + 1113025 = 4606^2 + 1055^2 .

It is a cyclic number.

It is not a de Polignac number, because 22328261 - 2⁶ = 22328197 is a prime.

It is a super-3 number, since 3×22328261³ (a number of 23 digits) contains 333 as substring.

Together with 22328263, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22328261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22328263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11164130 + 11164131.

It is an arithmetic number, because the mean of its divisors is an integer number (11164131).

Almost surely, 2^22328261 is an apocalyptic number.

It is an amenable number.

22328261 is a deficient number, since it is larger than the sum of its proper divisors (1).

22328261 is an equidigital number, since it uses as much as digits as its factorization.

22328261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 26.

The square root of 22328261 is about 4725.2789335657. The cubic root of 22328261 is about 281.5906952109.

The spelling of 22328261 in words is "twenty-two million, three hundred twenty-eight thousand, two hundred sixty-one".