217200146 has 4 divisors (see below), whose sum is σ = 325800222. Its totient is φ = 108600072.

The previous prime is 217200133. The next prime is 217200157. The reversal of 217200146 is 641002712.

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

It can be written as a sum of positive squares in only one way, i.e., 194742025 + 22458121 = 13955^2 + 4739^2 .

It is a super-3 number, since 3×217200146³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54300035 + ... + 54300038.

Almost surely, 2^217200146 is an apocalyptic number.

217200146 is a deficient number, since it is larger than the sum of its proper divisors (108600076).

217200146 is a wasteful number, since it uses less digits than its factorization.

217200146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108600075.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 217200146 is about 14737.7116948324. The cubic root of 217200146 is about 601.1091945120.

Adding to 217200146 its reverse (641002712), we get a palindrome (858202858).

The spelling of 217200146 in words is "two hundred seventeen million, two hundred thousand, one hundred forty-six".