55628129 has 2 divisors, whose sum is σ = 55628130. Its totient is φ = 55628128.

The previous prime is 55628113. The next prime is 55628141. The reversal of 55628129 is 92182655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31618129 + 24010000 = 5623^2 + 4900^2 .

It is a cyclic number.

It is not a de Polignac number, because 55628129 - 2⁴ = 55628113 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 55628092 and 55628101.

It is not a weakly prime, because it can be changed into another prime (55628149) 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, 27814064 + 27814065.

It is an arithmetic number, because the mean of its divisors is an integer number (27814065).

Almost surely, 2^55628129 is an apocalyptic number.

It is an amenable number.

55628129 is a deficient number, since it is larger than the sum of its proper divisors (1).

55628129 is an equidigital number, since it uses as much as digits as its factorization.

55628129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 38.

The square root of 55628129 is about 7458.4267107749. The cubic root of 55628129 is about 381.7374935987.

The spelling of 55628129 in words is "fifty-five million, six hundred twenty-eight thousand, one hundred twenty-nine".