55820181 has 8 divisors (see below), whose sum is σ = 76827904. Its totient is φ = 36012960.

The previous prime is 55820159. The next prime is 55820201. The reversal of 55820181 is 18102855.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55820181 - 2⁶ = 55820117 is a prime.

It is a super-2 number, since 2×55820181² = 6231785213745522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55820101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300016 + ... + 300201.

It is an arithmetic number, because the mean of its divisors is an integer number (9603488).

Almost surely, 2^55820181 is an apocalyptic number.

It is an amenable number.

55820181 is a deficient number, since it is larger than the sum of its proper divisors (21007723).

55820181 is a wasteful number, since it uses less digits than its factorization.

55820181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600251.

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 55820181 is about 7471.2904507856. The cubic root of 55820181 is about 382.1762958266.

The spelling of 55820181 in words is "fifty-five million, eight hundred twenty thousand, one hundred eighty-one".