549355643 has 2 divisors, whose sum is σ = 549355644. Its totient is φ = 549355642.

The previous prime is 549355577. The next prime is 549355649. The reversal of 549355643 is 346553945.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-549355643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 549355594 and 549355603.

It is not a weakly prime, because it can be changed into another prime (549355649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274677821 + 274677822.

It is an arithmetic number, because the mean of its divisors is an integer number (274677822).

Almost surely, 2^549355643 is an apocalyptic number.

549355643 is a deficient number, since it is larger than the sum of its proper divisors (1).

549355643 is an equidigital number, since it uses as much as digits as its factorization.

549355643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972000, while the sum is 44.

The square root of 549355643 is about 23438.3370357199. The cubic root of 549355643 is about 819.0011847223.

The spelling of 549355643 in words is "five hundred forty-nine million, three hundred fifty-five thousand, six hundred forty-three".