541565509 has 2 divisors, whose sum is σ = 541565510. Its totient is φ = 541565508.

The previous prime is 541565441. The next prime is 541565539. The reversal of 541565509 is 905565145.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 288660100 + 252905409 = 16990^2 + 15903^2 .

It is a cyclic number.

It is not a de Polignac number, because 541565509 - 2⁹ = 541564997 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (541565539) 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, 270782754 + 270782755.

It is an arithmetic number, because the mean of its divisors is an integer number (270782755).

Almost surely, 2^541565509 is an apocalyptic number.

It is an amenable number.

541565509 is a deficient number, since it is larger than the sum of its proper divisors (1).

541565509 is an equidigital number, since it uses as much as digits as its factorization.

541565509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 135000, while the sum is 40.

The square root of 541565509 is about 23271.5600895170. The cubic root of 541565509 is about 815.1114600342. Note that the first 3 decimals are identical.

The spelling of 541565509 in words is "five hundred forty-one million, five hundred sixty-five thousand, five hundred nine".