542661 has 8 divisors (see below), whose sum is σ = 826944. Its totient is φ = 310080.

The previous prime is 542603. The next prime is 542683. The reversal of 542661 is 166245.

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

It is not a de Polignac number, because 542661 - 2⁷ = 542533 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 542661.

It is not an unprimeable number, because it can be changed into a prime (542261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12900 + ... + 12941.

It is an arithmetic number, because the mean of its divisors is an integer number (103368).

2⁵⁴²⁶⁶¹ is an apocalyptic number.

It is an amenable number.

542661 is a deficient number, since it is larger than the sum of its proper divisors (284283).

542661 is a wasteful number, since it uses less digits than its factorization.

542661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25851.

The product of its digits is 1440, while the sum is 24.

The square root of 542661 is about 736.6552789467. The cubic root of 542661 is about 81.5660698515.

The spelling of 542661 in words is "five hundred forty-two thousand, six hundred sixty-one".