538649 has 2 divisors, whose sum is σ = 538650. Its totient is φ = 538648.

The previous prime is 538621. The next prime is 538651. The reversal of 538649 is 946835.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 403225 + 135424 = 635^2 + 368^2 .

It is a cyclic number.

It is not a de Polignac number, because 538649 - 2¹² = 534553 is a prime.

It is a Sophie Germain prime.

Together with 538651, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 5³ + 3¹² + 6 + 8³ + 4 + 9⁴ .

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (538049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269324 + 269325.

It is an arithmetic number, because the mean of its divisors is an integer number (269325).

2⁵³⁸⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

538649 is a deficient number, since it is larger than the sum of its proper divisors (1).

538649 is an equidigital number, since it uses as much as digits as its factorization.

538649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 35.

The square root of 538649 is about 733.9271080973. The cubic root of 538649 is about 81.3645610774.

The spelling of 538649 in words is "five hundred thirty-eight thousand, six hundred forty-nine".