213606643 has 2 divisors, whose sum is σ = 213606644. Its totient is φ = 213606642.

The previous prime is 213606641. The next prime is 213606703. The reversal of 213606643 is 346606312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213606643 - 2¹ = 213606641 is a prime.

Together with 213606641, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (213606641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106803321 + 106803322.

It is an arithmetic number, because the mean of its divisors is an integer number (106803322).

Almost surely, 2^213606643 is an apocalyptic number.

213606643 is a deficient number, since it is larger than the sum of its proper divisors (1).

213606643 is an equidigital number, since it uses as much as digits as its factorization.

213606643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 213606643 is about 14615.2879889518. The cubic root of 213606643 is about 597.7756929906.

The spelling of 213606643 in words is "two hundred thirteen million, six hundred six thousand, six hundred forty-three".