555542509 has 2 divisors, whose sum is σ = 555542510. Its totient is φ = 555542508.

The previous prime is 555542503. The next prime is 555542549. The reversal of 555542509 is 905245555.

It is a happy number.

It is an a-pointer prime, because the next prime (555542549) can be obtained adding 555542509 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 539261284 + 16281225 = 23222^2 + 4035^2 .

It is a cyclic number.

It is not a de Polignac number, because 555542509 - 2⁷ = 555542381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (555542503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277771254 + 277771255.

It is an arithmetic number, because the mean of its divisors is an integer number (277771255).

Almost surely, 2^555542509 is an apocalyptic number.

It is an amenable number.

555542509 is a deficient number, since it is larger than the sum of its proper divisors (1).

555542509 is an equidigital number, since it uses as much as digits as its factorization.

555542509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225000, while the sum is 40.

The square root of 555542509 is about 23569.9492786896. The cubic root of 555542509 is about 822.0642562785.

The spelling of 555542509 in words is "five hundred fifty-five million, five hundred forty-two thousand, five hundred nine".