539661 has 8 divisors (see below), whose sum is σ = 744480. Its totient is φ = 347312.

The previous prime is 539653. The next prime is 539663. The reversal of 539661 is 166935.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 539661 - 2³ = 539653 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 539661.

It is not an unprimeable number, because it can be changed into a prime (539663) 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, 3015 + ... + 3188.

It is an arithmetic number, because the mean of its divisors is an integer number (93060).

2⁵³⁹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

539661 is a deficient number, since it is larger than the sum of its proper divisors (204819).

539661 is a wasteful number, since it uses less digits than its factorization.

539661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6235.

The product of its digits is 4860, while the sum is 30.

The square root of 539661 is about 734.6162263386. The cubic root of 539661 is about 81.4154844201.

The spelling of 539661 in words is "five hundred thirty-nine thousand, six hundred sixty-one".