213665143 has 2 divisors, whose sum is σ = 213665144. Its totient is φ = 213665142.

The previous prime is 213665131. The next prime is 213665159. The reversal of 213665143 is 341566312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213665143 - 2¹⁷ = 213534071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213665743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106832571 + 106832572.

It is an arithmetic number, because the mean of its divisors is an integer number (106832572).

Almost surely, 2^213665143 is an apocalyptic number.

213665143 is a deficient number, since it is larger than the sum of its proper divisors (1).

213665143 is an equidigital number, since it uses as much as digits as its factorization.

213665143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 31.

The square root of 213665143 is about 14617.2891809665. The cubic root of 213665143 is about 597.8302585317.

The spelling of 213665143 in words is "two hundred thirteen million, six hundred sixty-five thousand, one hundred forty-three".