549764521 has 2 divisors, whose sum is σ = 549764522. Its totient is φ = 549764520.

The previous prime is 549764519. The next prime is 549764543. The reversal of 549764521 is 125467945.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 406627225 + 143137296 = 20165^2 + 11964^2 .

It is a cyclic number.

It is not a de Polignac number, because 549764521 - 2¹ = 549764519 is a prime.

Together with 549764519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (549764591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274882260 + 274882261.

It is an arithmetic number, because the mean of its divisors is an integer number (274882261).

Almost surely, 2^549764521 is an apocalyptic number.

It is an amenable number.

549764521 is a deficient number, since it is larger than the sum of its proper divisors (1).

549764521 is an equidigital number, since it uses as much as digits as its factorization.

549764521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 43.

The square root of 549764521 is about 23447.0578324872. The cubic root of 549764521 is about 819.2043248465.

The spelling of 549764521 in words is "five hundred forty-nine million, seven hundred sixty-four thousand, five hundred twenty-one".