54805181 has 4 divisors (see below), whose sum is σ = 54886812. Its totient is φ = 54723552.

The previous prime is 54805147. The next prime is 54805183. The reversal of 54805181 is 18150845.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18150845 = 5 ⋅3630169.

It can be written as a sum of positive squares in 2 ways, for example, as 38068900 + 16736281 = 6170^2 + 4091^2 .

It is a cyclic number.

It is not a de Polignac number, because 54805181 - 2¹⁰ = 54804157 is a prime.

It is a super-2 number, since 2×54805181² = 6007215728885522, 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 (54805183) 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, 39800 + ... + 41153.

It is an arithmetic number, because the mean of its divisors is an integer number (13721703).

Almost surely, 2^54805181 is an apocalyptic number.

It is an amenable number.

54805181 is a deficient number, since it is larger than the sum of its proper divisors (81631).

54805181 is an equidigital number, since it uses as much as digits as its factorization.

54805181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81630.

The product of its (nonzero) digits is 6400, while the sum is 32.

The square root of 54805181 is about 7403.0521408403. The cubic root of 54805181 is about 379.8456921959.

It can be divided in two parts, 5480 and 5181, that multiplied together give a triangular number (28391880 = T₇₅₃₅).

The spelling of 54805181 in words is "fifty-four million, eight hundred five thousand, one hundred eighty-one".