549781542 has 72 divisors (see below), whose sum is σ = 1239513912. Its totient is φ = 176057280.

The previous prime is 549781523. The next prime is 549781543. The reversal of 549781542 is 245187945.

549781542 is a `hidden beast` number, since 5 + 497 + 8 + 154 + 2 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549781543) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6623833 + ... + 6623915.

It is an arithmetic number, because the mean of its divisors is an integer number (17215471).

Almost surely, 2^549781542 is an apocalyptic number.

549781542 is an abundant number, since it is smaller than the sum of its proper divisors (689732370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

549781542 is a wasteful number, since it uses less digits than its factorization.

549781542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306 (or 232 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 549781542 is about 23447.4207963264. The cubic root of 549781542 is about 819.2127790921.

The spelling of 549781542 in words is "five hundred forty-nine million, seven hundred eighty-one thousand, five hundred forty-two".