55509123 has 8 divisors (see below), whose sum is σ = 74775568. Its totient is φ = 36624384.

The previous prime is 55509119. The next prime is 55509137. The reversal of 55509123 is 32190555.

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

It is not a de Polignac number, because 55509123 - 2² = 55509119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55509163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95086 + ... + 95667.

It is an arithmetic number, because the mean of its divisors is an integer number (9346946).

Almost surely, 2^55509123 is an apocalyptic number.

55509123 is a deficient number, since it is larger than the sum of its proper divisors (19266445).

55509123 is a wasteful number, since it uses less digits than its factorization.

55509123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190853.

The product of its (nonzero) digits is 6750, while the sum is 30.

The square root of 55509123 is about 7450.4444833849. Note that the first 4 decimals coincide. The cubic root of 55509123 is about 381.4650805396.

Adding to 55509123 its reverse (32190555), we get a palindrome (87699678).

The spelling of 55509123 in words is "fifty-five million, five hundred nine thousand, one hundred twenty-three".