55819619 has 4 divisors (see below), whose sum is σ = 59103144. Its totient is φ = 52536096.

The previous prime is 55819613. The next prime is 55819667. The reversal of 55819619 is 91691855.

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 55819619 - 2¹² = 55815523 is a prime.

It is a super-2 number, since 2×55819619² = 6231659730610322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55819619.

It is not an unprimeable number, because it can be changed into a prime (55819613) 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, 1641737 + ... + 1641770.

It is an arithmetic number, because the mean of its divisors is an integer number (14775786).

Almost surely, 2^55819619 is an apocalyptic number.

55819619 is a deficient number, since it is larger than the sum of its proper divisors (3283525).

55819619 is a wasteful number, since it uses less digits than its factorization.

55819619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3283524.

The product of its digits is 97200, while the sum is 44.

The square root of 55819619 is about 7471.2528400530. The cubic root of 55819619 is about 382.1750132331.

The spelling of 55819619 in words is "fifty-five million, eight hundred nineteen thousand, six hundred nineteen".