55163321 has 2 divisors, whose sum is σ = 55163322. Its totient is φ = 55163320.

The previous prime is 55163267. The next prime is 55163341. The reversal of 55163321 is 12336155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35271721 + 19891600 = 5939^2 + 4460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55163321 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55163341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27581660 + 27581661.

It is an arithmetic number, because the mean of its divisors is an integer number (27581661).

Almost surely, 2^55163321 is an apocalyptic number.

It is an amenable number.

55163321 is a deficient number, since it is larger than the sum of its proper divisors (1).

55163321 is an equidigital number, since it uses as much as digits as its factorization.

55163321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 26.

The square root of 55163321 is about 7427.2014244936. The cubic root of 55163321 is about 380.6712995484.

Adding to 55163321 its reverse (12336155), we get a palindrome (67499476).

The spelling of 55163321 in words is "fifty-five million, one hundred sixty-three thousand, three hundred twenty-one".