212506647 has 16 divisors (see below), whose sum is σ = 304492032. Its totient is φ = 131345280.

The previous prime is 212506597. The next prime is 212506661. The reversal of 212506647 is 746605212.

It is not a de Polignac number, because 212506647 - 2⁸ = 212506391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212506247) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 27679 + ... + 34512.

It is an arithmetic number, because the mean of its divisors is an integer number (19030752).

Almost surely, 2^212506647 is an apocalyptic number.

212506647 is a deficient number, since it is larger than the sum of its proper divisors (91985385).

212506647 is a wasteful number, since it uses less digits than its factorization.

212506647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62278.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 212506647 is about 14577.6077255495. The cubic root of 212506647 is about 596.7478179245.

The spelling of 212506647 in words is "two hundred twelve million, five hundred six thousand, six hundred forty-seven".