540121 has 2 divisors, whose sum is σ = 540122. Its totient is φ = 540120.

The previous prime is 540119. The next prime is 540139. The reversal of 540121 is 121045.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 440896 + 99225 = 664^2 + 315^2 .

It is a cyclic number.

It is not a de Polignac number, because 540121 - 2¹ = 540119 is a prime.

Together with 540119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (540101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 270060 + 270061.

It is an arithmetic number, because the mean of its divisors is an integer number (270061).

2⁵⁴⁰¹²¹ is an apocalyptic number.

It is an amenable number.

540121 is a deficient number, since it is larger than the sum of its proper divisors (1).

540121 is an equidigital number, since it uses as much as digits as its factorization.

540121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 540121 is about 734.9292482954. The cubic root of 540121 is about 81.4386103497.

Adding to 540121 its reverse (121045), we get a palindrome (661166).

The spelling of 540121 in words is "five hundred forty thousand, one hundred twenty-one".