55212205 has 8 divisors (see below), whose sum is σ = 66592152. Its totient is φ = 43944768.

The previous prime is 55212203. The next prime is 55212217. The reversal of 55212205 is 50221255.

It can be written as a sum of positive squares in 4 ways, for example, as 31573161 + 23639044 = 5619^2 + 4862^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 55212205 - 2¹ = 55212203 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55212203) 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, 27042 + ... + 29011.

It is an arithmetic number, because the mean of its divisors is an integer number (8324019).

Almost surely, 2^55212205 is an apocalyptic number.

It is an amenable number.

55212205 is a deficient number, since it is larger than the sum of its proper divisors (11379947).

55212205 is a wasteful number, since it uses less digits than its factorization.

55212205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56255.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 55212205 is about 7430.4915718948. The cubic root of 55212205 is about 380.7837126600.

It can be divided in two parts, 5 and 5212205, that multiplied together give a square (26061025 = 5105²).

The spelling of 55212205 in words is "fifty-five million, two hundred twelve thousand, two hundred five".