55215129 has 8 divisors (see below), whose sum is σ = 73751392. Its totient is φ = 36744480.

The previous prime is 55215119. The next prime is 55215161. The reversal of 55215129 is 92151255.

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

It is not a de Polignac number, because 55215129 - 2²⁴ = 38437913 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55215096 and 55215105.

It is not an unprimeable number, because it can be changed into a prime (55215119) 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, 14404 + ... + 17829.

It is an arithmetic number, because the mean of its divisors is an integer number (9218924).

Almost surely, 2^55215129 is an apocalyptic number.

It is an amenable number.

55215129 is a deficient number, since it is larger than the sum of its proper divisors (18536263).

55215129 is a wasteful number, since it uses less digits than its factorization.

55215129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32807.

The product of its digits is 4500, while the sum is 30.

The square root of 55215129 is about 7430.6883261243. The cubic root of 55215129 is about 380.7904345550.

The spelling of 55215129 in words is "fifty-five million, two hundred fifteen thousand, one hundred twenty-nine".