542656209 has 8 divisors (see below), whose sum is σ = 746881792. Its totient is φ = 350100720.

The previous prime is 542656189. The next prime is 542656243. The reversal of 542656209 is 902656245.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 542656209 - 2¹⁶ = 542590673 is a prime.

It is a super-2 number, since 2×542656209² = 588951522332503362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (542656409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2917414 + ... + 2917599.

It is an arithmetic number, because the mean of its divisors is an integer number (93360224).

Almost surely, 2^542656209 is an apocalyptic number.

It is an amenable number.

542656209 is a deficient number, since it is larger than the sum of its proper divisors (204225583).

542656209 is a wasteful number, since it uses less digits than its factorization.

542656209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5835047.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 542656209 is about 23294.9824855053. The cubic root of 542656209 is about 815.6582980960.

The spelling of 542656209 in words is "five hundred forty-two million, six hundred fifty-six thousand, two hundred nine".