215055550 has 24 divisors (see below), whose sum is σ = 408518496. Its totient is φ = 84191040.

The previous prime is 215055523. The next prime is 215055551. The reversal of 215055550 is 55550512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215055551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43407 + ... + 48106.

It is an arithmetic number, because the mean of its divisors is an integer number (17021604).

Almost surely, 2^215055550 is an apocalyptic number.

215055550 is a deficient number, since it is larger than the sum of its proper divisors (193462946).

215055550 is a wasteful number, since it uses less digits than its factorization.

215055550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91572 (or 91567 counting only the distinct ones).

The product of its (nonzero) digits is 6250, while the sum is 28.

The square root of 215055550 is about 14664.7724155542. The cubic root of 215055550 is about 599.1242315974.

The spelling of 215055550 in words is "two hundred fifteen million, fifty-five thousand, five hundred fifty".