549507818 has 4 divisors (see below), whose sum is σ = 824261730. Its totient is φ = 274753908.

The previous prime is 549507811. The next prime is 549507823. The reversal of 549507818 is 818705945.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 407111329 + 142396489 = 20177^2 + 11933^2 .

It is a super-2 number, since 2×549507818² = 603917684086242248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (549507811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137376953 + ... + 137376956.

Almost surely, 2^549507818 is an apocalyptic number.

549507818 is a deficient number, since it is larger than the sum of its proper divisors (274753912).

549507818 is a wasteful number, since it uses less digits than its factorization.

549507818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274753911.

The product of its (nonzero) digits is 403200, while the sum is 47.

The square root of 549507818 is about 23441.5830950045. The cubic root of 549507818 is about 819.0768005829.

The spelling of 549507818 in words is "five hundred forty-nine million, five hundred seven thousand, eight hundred eighteen".