55018081 has 4 divisors (see below), whose sum is σ = 56056212. Its totient is φ = 53979952.

The previous prime is 55018079. The next prime is 55018097. The reversal of 55018081 is 18081055.

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 38688400 + 16329681 = 6220^2 + 4041^2 .

It is a cyclic number.

It is not a de Polignac number, because 55018081 - 2¹ = 55018079 is a prime.

It is a super-2 number, since 2×55018081² = 6053978473845122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55018021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 518986 + ... + 519091.

It is an arithmetic number, because the mean of its divisors is an integer number (14014053).

Almost surely, 2^55018081 is an apocalyptic number.

It is an amenable number.

55018081 is a deficient number, since it is larger than the sum of its proper divisors (1038131).

55018081 is a wasteful number, since it uses less digits than its factorization.

55018081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038130.

The product of its (nonzero) digits is 1600, while the sum is 28.

The square root of 55018081 is about 7417.4174076966. The cubic root of 55018081 is about 380.3369149548.

The spelling of 55018081 in words is "fifty-five million, eighteen thousand, eighty-one".