55819019 has 4 divisors (see below), whose sum is σ = 55841640. Its totient is φ = 55796400.

The previous prime is 55818991. The next prime is 55819037. The reversal of 55819019 is 91091855.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91091855 = 5 ⋅18218371.

It is a cyclic number.

It is not a de Polignac number, because 55819019 - 2¹⁶ = 55753483 is a prime.

It is a super-2 number, since 2×55819019² = 6231525764244722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55819069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7082 + ... + 12719.

It is an arithmetic number, because the mean of its divisors is an integer number (13960410).

Almost surely, 2^55819019 is an apocalyptic number.

55819019 is a deficient number, since it is larger than the sum of its proper divisors (22621).

55819019 is a wasteful number, since it uses less digits than its factorization.

55819019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22620.

The product of its (nonzero) digits is 16200, while the sum is 38.

The square root of 55819019 is about 7471.2126860370. The cubic root of 55819019 is about 382.1736439067.

The spelling of 55819019 in words is "fifty-five million, eight hundred nineteen thousand, nineteen".