213284647 has 4 divisors (see below), whose sum is σ = 220639320. Its totient is φ = 205929976.

The previous prime is 213284641. The next prime is 213284653. The reversal of 213284647 is 746482312.

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

It is an interprime number because it is at equal distance from previous prime (213284641) and next prime (213284653).

It is a cyclic number.

It is not a de Polignac number, because 213284647 - 2¹¹ = 213282599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213284641) 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 3 ways as a sum of consecutive naturals, for example, 3677293 + ... + 3677350.

It is an arithmetic number, because the mean of its divisors is an integer number (55159830).

Almost surely, 2^213284647 is an apocalyptic number.

213284647 is a deficient number, since it is larger than the sum of its proper divisors (7354673).

213284647 is an equidigital number, since it uses as much as digits as its factorization.

213284647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7354672.

The product of its digits is 64512, while the sum is 37.

The square root of 213284647 is about 14604.2681090153. The cubic root of 213284647 is about 597.4751745899.

The spelling of 213284647 in words is "two hundred thirteen million, two hundred eighty-four thousand, six hundred forty-seven".