55129109 has 8 divisors (see below), whose sum is σ = 63231168. Its totient is φ = 47083680.

The previous prime is 55129103. The next prime is 55129111. The reversal of 55129109 is 90192155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55129109 - 2⁴ = 55129093 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55129103) 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 in 7 ways as a sum of consecutive naturals, for example, 12047 + ... + 15980.

It is an arithmetic number, because the mean of its divisors is an integer number (7903896).

Almost surely, 2^55129109 is an apocalyptic number.

It is an amenable number.

55129109 is a deficient number, since it is larger than the sum of its proper divisors (8102059).

55129109 is a wasteful number, since it uses less digits than its factorization.

55129109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28315.

The product of its (nonzero) digits is 4050, while the sum is 32.

The square root of 55129109 is about 7424.8979117561. The cubic root of 55129109 is about 380.5925864980.

The spelling of 55129109 in words is "fifty-five million, one hundred twenty-nine thousand, one hundred nine".