55128101 has 16 divisors (see below), whose sum is σ = 68611200. Its totient is φ = 43219008.

The previous prime is 55128091. The next prime is 55128131. The reversal of 55128101 is 10182155.

It is not a de Polignac number, because 55128101 - 2⁶ = 55128037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55128131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3290 + ... + 11003.

It is an arithmetic number, because the mean of its divisors is an integer number (4288200).

Almost surely, 2^55128101 is an apocalyptic number.

It is an amenable number.

55128101 is a deficient number, since it is larger than the sum of its proper divisors (13483099).

55128101 is a wasteful number, since it uses less digits than its factorization.

55128101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14348.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 55128101 is about 7424.8300317246. The cubic root of 55128101 is about 380.5902668543.

The spelling of 55128101 in words is "fifty-five million, one hundred twenty-eight thousand, one hundred one".