55505081 has 2 divisors, whose sum is σ = 55505082. Its totient is φ = 55505080.

The previous prime is 55505071. The next prime is 55505123. The reversal of 55505081 is 18050555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51265600 + 4239481 = 7160^2 + 2059^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55505081 is a prime.

It is a super-2 number, since 2×55505081² = 6161628033633122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55505071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27752540 + 27752541.

It is an arithmetic number, because the mean of its divisors is an integer number (27752541).

Almost surely, 2^55505081 is an apocalyptic number.

It is an amenable number.

55505081 is a deficient number, since it is larger than the sum of its proper divisors (1).

55505081 is an equidigital number, since it uses as much as digits as its factorization.

55505081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5000, while the sum is 29.

The square root of 55505081 is about 7450.1732194628. The cubic root of 55505081 is about 381.4558212851.

The spelling of 55505081 in words is "fifty-five million, five hundred five thousand, eighty-one".