55509019 has 4 divisors (see below), whose sum is σ = 55556440. Its totient is φ = 55461600.

The previous prime is 55508983. The next prime is 55509037. The reversal of 55509019 is 91090555.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55509019 - 2²¹ = 53411867 is a prime.

It is a super-2 number, since 2×55509019² = 6162502380684722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55509059) 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 in 3 ways as a sum of consecutive naturals, for example, 21909 + ... + 24310.

It is an arithmetic number, because the mean of its divisors is an integer number (13889110).

Almost surely, 2^55509019 is an apocalyptic number.

55509019 is a deficient number, since it is larger than the sum of its proper divisors (47421).

55509019 is a wasteful number, since it uses less digits than its factorization.

55509019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47420.

The product of its (nonzero) digits is 10125, while the sum is 34.

The square root of 55509019 is about 7450.4375039322. The cubic root of 55509019 is about 381.4648423061.

The spelling of 55509019 in words is "fifty-five million, five hundred nine thousand, nineteen".