540633209 has 2 divisors, whose sum is σ = 540633210. Its totient is φ = 540633208.

The previous prime is 540633173. The next prime is 540633253. The reversal of 540633209 is 902336045.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 538240000 + 2393209 = 23200^2 + 1547^2 .

It is a cyclic number.

It is not a de Polignac number, because 540633209 - 2¹² = 540629113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (540603209) 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, 270316604 + 270316605.

It is an arithmetic number, because the mean of its divisors is an integer number (270316605).

Almost surely, 2^540633209 is an apocalyptic number.

It is an amenable number.

540633209 is a deficient number, since it is larger than the sum of its proper divisors (1).

540633209 is an equidigital number, since it uses as much as digits as its factorization.

540633209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 540633209 is about 23251.5205739324. The cubic root of 540633209 is about 814.6434557706.

The spelling of 540633209 in words is "five hundred forty million, six hundred thirty-three thousand, two hundred nine".