542451509 has 2 divisors, whose sum is σ = 542451510. Its totient is φ = 542451508.

The previous prime is 542451499. The next prime is 542451541. The reversal of 542451509 is 905154245.

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., 490755409 + 51696100 = 22153^2 + 7190^2 .

It is a cyclic number.

It is not a de Polignac number, because 542451509 - 2¹⁶ = 542385973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (542451599) 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, 271225754 + 271225755.

It is an arithmetic number, because the mean of its divisors is an integer number (271225755).

Almost surely, 2^542451509 is an apocalyptic number.

It is an amenable number.

542451509 is a deficient number, since it is larger than the sum of its proper divisors (1).

542451509 is an equidigital number, since it uses as much as digits as its factorization.

542451509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36000, while the sum is 35.

The square root of 542451509 is about 23290.5884210769. The cubic root of 542451509 is about 815.5557247113. Note that the first 3 decimals are identical.

The spelling of 542451509 in words is "five hundred forty-two million, four hundred fifty-one thousand, five hundred nine".