538561 has 2 divisors, whose sum is σ = 538562. Its totient is φ = 538560.

The previous prime is 538553. The next prime is 538567. The reversal of 538561 is 165835.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 330625 + 207936 = 575^2 + 456^2 .

It is a cyclic number.

It is not a de Polignac number, because 538561 - 2³ = 538553 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (538567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269280 + 269281.

It is an arithmetic number, because the mean of its divisors is an integer number (269281).

2⁵³⁸⁵⁶¹ is an apocalyptic number.

It is an amenable number.

538561 is a deficient number, since it is larger than the sum of its proper divisors (1).

538561 is an equidigital number, since it uses as much as digits as its factorization.

538561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 28.

The square root of 538561 is about 733.8671541907. The cubic root of 538561 is about 81.3601299474.

The spelling of 538561 in words is "five hundred thirty-eight thousand, five hundred sixty-one".