542506549 has 4 divisors (see below), whose sum is σ = 584237836. Its totient is φ = 500775264.

The previous prime is 542506537. The next prime is 542506553. The reversal of 542506549 is 945605245.

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

It can be written as a sum of positive squares in 2 ways, for example, as 338302449 + 204204100 = 18393^2 + 14290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-542506549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542506519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20865624 + ... + 20865649.

It is an arithmetic number, because the mean of its divisors is an integer number (146059459).

Almost surely, 2^542506549 is an apocalyptic number.

It is an amenable number.

542506549 is a deficient number, since it is larger than the sum of its proper divisors (41731287).

542506549 is a wasteful number, since it uses less digits than its factorization.

542506549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41731286.

The product of its (nonzero) digits is 216000, while the sum is 40.

The square root of 542506549 is about 23291.7699842670. The cubic root of 542506549 is about 815.5833073113.

The spelling of 542506549 in words is "five hundred forty-two million, five hundred six thousand, five hundred forty-nine".