213809533 has 8 divisors (see below), whose sum is σ = 249553152. Its totient is φ = 179365776.

The previous prime is 213809521. The next prime is 213809551. The reversal of 213809533 is 335908312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213809533 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 (213803533) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 324610 + ... + 325267.

It is an arithmetic number, because the mean of its divisors is an integer number (31194144).

Almost surely, 2^213809533 is an apocalyptic number.

It is an amenable number.

213809533 is a deficient number, since it is larger than the sum of its proper divisors (35743619).

213809533 is an equidigital number, since it uses as much as digits as its factorization.

213809533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649931.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 213809533 is about 14622.2273611102. The cubic root of 213809533 is about 597.9648948643.

The spelling of 213809533 in words is "two hundred thirteen million, eight hundred nine thousand, five hundred thirty-three".