540161521 has 2 divisors, whose sum is σ = 540161522. Its totient is φ = 540161520.

The previous prime is 540161513. The next prime is 540161543. The reversal of 540161521 is 125161045.

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., 530150625 + 10010896 = 23025^2 + 3164^2 .

It is a cyclic number.

It is not a de Polignac number, because 540161521 - 2³ = 540161513 is a prime.

It is not a weakly prime, because it can be changed into another prime (540161581) 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, 270080760 + 270080761.

It is an arithmetic number, because the mean of its divisors is an integer number (270080761).

Almost surely, 2^540161521 is an apocalyptic number.

It is an amenable number.

540161521 is a deficient number, since it is larger than the sum of its proper divisors (1).

540161521 is an equidigital number, since it uses as much as digits as its factorization.

540161521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 540161521 is about 23241.3751959732. The cubic root of 540161521 is about 814.4064686343.

The spelling of 540161521 in words is "five hundred forty million, one hundred sixty-one thousand, five hundred twenty-one".