549239993 has 2 divisors, whose sum is σ = 549239994. Its totient is φ = 549239992.

The previous prime is 549239983. The next prime is 549240017. The reversal of 549239993 is 399932945.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 449779264 + 99460729 = 21208^2 + 9973^2 .

It is a cyclic number.

It is not a de Polignac number, because 549239993 - 2²⁰ = 548191417 is a prime.

It is not a weakly prime, because it can be changed into another prime (549239983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274619996 + 274619997.

It is an arithmetic number, because the mean of its divisors is an integer number (274619997).

Almost surely, 2^549239993 is an apocalyptic number.

It is an amenable number.

549239993 is a deficient number, since it is larger than the sum of its proper divisors (1).

549239993 is an equidigital number, since it uses as much as digits as its factorization.

549239993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2361960, while the sum is 53.

The square root of 549239993 is about 23435.8697939718. The cubic root of 549239993 is about 818.9437088196.

The spelling of 549239993 in words is "five hundred forty-nine million, two hundred thirty-nine thousand, nine hundred ninety-three".