55278329 has 2 divisors, whose sum is σ = 55278330. Its totient is φ = 55278328.

The previous prime is 55278319. The next prime is 55278337. The reversal of 55278329 is 92387255.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28601104 + 26677225 = 5348^2 + 5165^2 .

It is a cyclic number.

It is not a de Polignac number, because 55278329 - 2⁴ = 55278313 is a prime.

It is a Chen prime.

It is equal to p_3297839 and since 55278329 and 3297839 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (55278319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27639164 + 27639165.

It is an arithmetic number, because the mean of its divisors is an integer number (27639165).

Almost surely, 2^55278329 is an apocalyptic number.

It is an amenable number.

55278329 is a deficient number, since it is larger than the sum of its proper divisors (1).

55278329 is an equidigital number, since it uses as much as digits as its factorization.

55278329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 41.

The square root of 55278329 is about 7434.9397442077. The cubic root of 55278329 is about 380.9356651567.

The spelling of 55278329 in words is "fifty-five million, two hundred seventy-eight thousand, three hundred twenty-nine".