43649549 has 2 divisors, whose sum is σ = 43649550. Its totient is φ = 43649548.

The previous prime is 43649539. The next prime is 43649563. The reversal of 43649549 is 94594634.

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., 30327049 + 13322500 = 5507^2 + 3650^2 .

It is a cyclic number.

It is not a de Polignac number, because 43649549 - 2⁸ = 43649293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43649539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21824774 + 21824775.

It is an arithmetic number, because the mean of its divisors is an integer number (21824775).

Almost surely, 2^43649549 is an apocalyptic number.

It is an amenable number.

43649549 is a deficient number, since it is larger than the sum of its proper divisors (1).

43649549 is an equidigital number, since it uses as much as digits as its factorization.

43649549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 44.

The square root of 43649549 is about 6606.7805321503. The cubic root of 43649549 is about 352.0950506268.

The spelling of 43649549 in words is "forty-three million, six hundred forty-nine thousand, five hundred forty-nine".