215055229 has 4 divisors (see below), whose sum is σ = 215413660. Its totient is φ = 214696800.

The previous prime is 215055223. The next prime is 215055251. The reversal of 215055229 is 922550512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 203832729 + 11222500 = 14277^2 + 3350^2 .

It is a cyclic number.

It is not a de Polignac number, because 215055229 - 2¹³ = 215047037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215055229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215055223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178314 + ... + 179515.

It is an arithmetic number, because the mean of its divisors is an integer number (53853415).

Almost surely, 2^215055229 is an apocalyptic number.

It is an amenable number.

215055229 is a deficient number, since it is larger than the sum of its proper divisors (358431).

215055229 is an equidigital number, since it uses as much as digits as its factorization.

215055229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358430.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 215055229 is about 14664.7614709548. The cubic root of 215055229 is about 599.1239335054.

The spelling of 215055229 in words is "two hundred fifteen million, fifty-five thousand, two hundred twenty-nine".