201217912 has 24 divisors (see below), whose sum is σ = 438881760. Its totient is φ = 86236080.

The previous prime is 201217903. The next prime is 201218009. The reversal of 201217912 is 219712102.

201217912 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 256264 + ... + 257047.

It is an arithmetic number, because the mean of its divisors is an integer number (18286740).

Almost surely, 2^201217912 is an apocalyptic number.

It is an amenable number.

201217912 is an abundant number, since it is smaller than the sum of its proper divisors (237663848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201217912 is a wasteful number, since it uses less digits than its factorization.

201217912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513331 (or 513320 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 201217912 is about 14185.1299606313. The cubic root of 201217912 is about 585.9882116232.

The spelling of 201217912 in words is "two hundred one million, two hundred seventeen thousand, nine hundred twelve".