539921 has 2 divisors, whose sum is σ = 539922. Its totient is φ = 539920.

The previous prime is 539899. The next prime is 539947. The reversal of 539921 is 129935.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 409600 + 130321 = 640^2 + 361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-539921 is a prime.

It is a d-powerful number, because it can be written as 5³ + 3¹² + 9² + 9² + 2¹³ + 1 .

It is not a weakly prime, because it can be changed into another prime (539321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269960 + 269961.

It is an arithmetic number, because the mean of its divisors is an integer number (269961).

2⁵³⁹⁹²¹ is an apocalyptic number.

It is an amenable number.

539921 is a deficient number, since it is larger than the sum of its proper divisors (1).

539921 is an equidigital number, since it uses as much as digits as its factorization.

539921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2430, while the sum is 29.

The square root of 539921 is about 734.7931681773. The cubic root of 539921 is about 81.4285572117.

The spelling of 539921 in words is "five hundred thirty-nine thousand, nine hundred twenty-one".