538621 has 2 divisors, whose sum is σ = 538622. Its totient is φ = 538620.

The previous prime is 538597. The next prime is 538649. The reversal of 538621 is 126835.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 525625 + 12996 = 725^2 + 114^2 .

It is a cyclic number.

It is not a de Polignac number, because 538621 - 2⁵ = 538589 is a prime.

It is a super-2 number, since 2×538621² = 580225163282, which contains 22 as substring.

538621 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (538651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269310 + 269311.

It is an arithmetic number, because the mean of its divisors is an integer number (269311).

2⁵³⁸⁶²¹ is an apocalyptic number.

It is an amenable number.

538621 is a deficient number, since it is larger than the sum of its proper divisors (1).

538621 is an equidigital number, since it uses as much as digits as its factorization.

538621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 538621 is about 733.9080323855. The cubic root of 538621 is about 81.3631512247.

The spelling of 538621 in words is "five hundred thirty-eight thousand, six hundred twenty-one".