55784161 has 4 divisors (see below), whose sum is σ = 56023812. Its totient is φ = 55544512.

The previous prime is 55784153. The next prime is 55784167. The reversal of 55784161 is 16148755.

55784161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21911761 + 33872400 = 4681^2 + 5820^2 .

It is a cyclic number.

It is not a de Polignac number, because 55784161 - 2³ = 55784153 is a prime.

It is a super-2 number, since 2×55784161² = 6223745236947842, 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 55784161.

It is not an unprimeable number, because it can be changed into a prime (55784167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119476 + ... + 119941.

It is an arithmetic number, because the mean of its divisors is an integer number (14005953).

Almost surely, 2^55784161 is an apocalyptic number.

It is an amenable number.

55784161 is a deficient number, since it is larger than the sum of its proper divisors (239651).

55784161 is a wasteful number, since it uses less digits than its factorization.

55784161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239650.

The product of its digits is 33600, while the sum is 37.

The square root of 55784161 is about 7468.8795009693. The cubic root of 55784161 is about 382.0940737581.

It can be divided in two parts, 55784 and 161, that added together give a triangular number (55945 = T₃₃₄).

The spelling of 55784161 in words is "fifty-five million, seven hundred eighty-four thousand, one hundred sixty-one".