55554509 has 2 divisors, whose sum is σ = 55554510. Its totient is φ = 55554508.

The previous prime is 55554503. The next prime is 55554523. The reversal of 55554509 is 90545555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53655625 + 1898884 = 7325^2 + 1378^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55554509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55554503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27777254 + 27777255.

It is an arithmetic number, because the mean of its divisors is an integer number (27777255).

Almost surely, 2^55554509 is an apocalyptic number.

It is an amenable number.

55554509 is a deficient number, since it is larger than the sum of its proper divisors (1).

55554509 is an equidigital number, since it uses as much as digits as its factorization.

55554509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112500, while the sum is 38.

The square root of 55554509 is about 7453.4897195877. The cubic root of 55554509 is about 381.5690181553.

The spelling of 55554509 in words is "fifty-five million, five hundred fifty-four thousand, five hundred nine".