622549 has 2 divisors, whose sum is σ = 622550. Its totient is φ = 622548.

The previous prime is 622547. The next prime is 622561. The reversal of 622549 is 945226.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 611524 + 11025 = 782^2 + 105^2 .

It is a cyclic number.

It is not a de Polignac number, because 622549 - 2¹ = 622547 is a prime.

Together with 622547, it forms a pair of twin primes.

It is a Chen prime.

622549 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (622547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311274 + 311275.

It is an arithmetic number, because the mean of its divisors is an integer number (311275).

2⁶²²⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

622549 is a deficient number, since it is larger than the sum of its proper divisors (1).

622549 is an equidigital number, since it uses as much as digits as its factorization.

622549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 28.

The square root of 622549 is about 789.0177437802. The cubic root of 622549 is about 85.3868868889.

Subtracting from 622549 its sum of digits (28), we obtain a square (622521 = 789²).

The spelling of 622549 in words is "six hundred twenty-two thousand, five hundred forty-nine".