55330181 has 2 divisors, whose sum is σ = 55330182. Its totient is φ = 55330180.

The previous prime is 55330169. The next prime is 55330183. The reversal of 55330181 is 18103355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40576900 + 14753281 = 6370^2 + 3841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55330181 is a prime.

It is a super-2 number, since 2×55330181² = 6122857858985522, which contains 22 as substring.

Together with 55330183, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55330181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55330183) 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 as a sum of consecutive naturals, namely, 27665090 + 27665091.

It is an arithmetic number, because the mean of its divisors is an integer number (27665091).

Almost surely, 2^55330181 is an apocalyptic number.

It is an amenable number.

55330181 is a deficient number, since it is larger than the sum of its proper divisors (1).

55330181 is an equidigital number, since it uses as much as digits as its factorization.

55330181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 55330181 is about 7438.4259759710. The cubic root of 55330181 is about 381.0547359492.

The spelling of 55330181 in words is "fifty-five million, three hundred thirty thousand, one hundred eighty-one".