55212155 has 8 divisors (see below), whose sum is σ = 66911184. Its totient is φ = 43732000.

The previous prime is 55212127. The next prime is 55212173. The reversal of 55212155 is 55121255.

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

It is not a de Polignac number, because 55212155 - 2¹² = 55208059 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54161 + ... + 55170.

It is an arithmetic number, because the mean of its divisors is an integer number (8363898).

Almost surely, 2^55212155 is an apocalyptic number.

55212155 is a deficient number, since it is larger than the sum of its proper divisors (11699029).

55212155 is a wasteful number, since it uses less digits than its factorization.

55212155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109437.

The product of its digits is 2500, while the sum is 26.

The square root of 55212155 is about 7430.4882073791. The cubic root of 55212155 is about 380.7835977145.

The spelling of 55212155 in words is "fifty-five million, two hundred twelve thousand, one hundred fifty-five".