55819559 has 4 divisors (see below), whose sum is σ = 56112000. Its totient is φ = 55527120.

The previous prime is 55819553. The next prime is 55819567. The reversal of 55819559 is 95591855.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95591855 = 5 ⋅19118371.

It is a cyclic number.

It is not a de Polignac number, because 55819559 - 2²⁰ = 54770983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55819553) 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, 145934 + ... + 146315.

It is an arithmetic number, because the mean of its divisors is an integer number (14028000).

Almost surely, 2^55819559 is an apocalyptic number.

55819559 is a deficient number, since it is larger than the sum of its proper divisors (292441).

55819559 is a wasteful number, since it uses less digits than its factorization.

55819559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292440.

The product of its digits is 405000, while the sum is 47.

The square root of 55819559 is about 7471.2488246611. The cubic root of 55819559 is about 382.1748763009.

The spelling of 55819559 in words is "fifty-five million, eight hundred nineteen thousand, five hundred fifty-nine".