55081121 has 8 divisors (see below), whose sum is σ = 57623400. Its totient is φ = 52581760.

The previous prime is 55081099. The next prime is 55081127. The reversal of 55081121 is 12118055.

It can be written as a sum of positive squares in 4 ways, for example, as 17430625 + 37650496 = 4175^2 + 6136^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55081121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55081127) 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 7 ways as a sum of consecutive naturals, for example, 8090 + ... + 13251.

It is an arithmetic number, because the mean of its divisors is an integer number (7202925).

Almost surely, 2^55081121 is an apocalyptic number.

It is an amenable number.

55081121 is a deficient number, since it is larger than the sum of its proper divisors (2542279).

55081121 is a wasteful number, since it uses less digits than its factorization.

55081121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21459.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 55081121 is about 7421.6656486263. The cubic root of 55081121 is about 380.4821235061.

Adding to 55081121 its reverse (12118055), we get a palindrome (67199176).

The spelling of 55081121 in words is "fifty-five million, eighty-one thousand, one hundred twenty-one".