538921 has 2 divisors, whose sum is σ = 538922. Its totient is φ = 538920.

The previous prime is 538877. The next prime is 538927. The reversal of 538921 is 129835.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 469225 + 69696 = 685^2 + 264^2 .

It is a cyclic number.

It is not a de Polignac number, because 538921 - 2¹⁹ = 14633 is a prime.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 538921.

It is not a weakly prime, because it can be changed into another prime (538927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269460 + 269461.

It is an arithmetic number, because the mean of its divisors is an integer number (269461).

2⁵³⁸⁹²¹ is an apocalyptic number.

It is an amenable number.

538921 is a deficient number, since it is larger than the sum of its proper divisors (1).

538921 is an equidigital number, since it uses as much as digits as its factorization.

538921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 28.

The square root of 538921 is about 734.1123892157. The cubic root of 538921 is about 81.3782542471.

The spelling of 538921 in words is "five hundred thirty-eight thousand, nine hundred twenty-one".