22156549 has 2 divisors, whose sum is σ = 22156550. Its totient is φ = 22156548.

The previous prime is 22156543. The next prime is 22156571. The reversal of 22156549 is 94565122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21095649 + 1060900 = 4593^2 + 1030^2 .

It is a cyclic number.

It is not a de Polignac number, because 22156549 - 2⁵ = 22156517 is a prime.

It is equal to p_1398472 and since 22156549 and 1398472 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22156543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11078274 + 11078275.

It is an arithmetic number, because the mean of its divisors is an integer number (11078275).

Almost surely, 2^22156549 is an apocalyptic number.

It is an amenable number.

22156549 is a deficient number, since it is larger than the sum of its proper divisors (1).

22156549 is an equidigital number, since it uses as much as digits as its factorization.

22156549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 34.

The square root of 22156549 is about 4707.0743567528. The cubic root of 22156549 is about 280.8669937865.

The spelling of 22156549 in words is "twenty-two million, one hundred fifty-six thousand, five hundred forty-nine".