213183281 has 8 divisors (see below), whose sum is σ = 226310760. Its totient is φ = 200121088.

The previous prime is 213183277. The next prime is 213183319. The reversal of 213183281 is 182381312.

It can be written as a sum of positive squares in 4 ways, for example, as 91853056 + 121330225 = 9584^2 + 11015^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 213183281 - 2² = 213183277 is a prime.

It is a super-3 number, since 3×213183281³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213183221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9506 + ... + 22731.

It is an arithmetic number, because the mean of its divisors is an integer number (28288845).

Almost surely, 2^213183281 is an apocalyptic number.

It is an amenable number.

213183281 is a deficient number, since it is larger than the sum of its proper divisors (13127479).

213183281 is a wasteful number, since it uses less digits than its factorization.

213183281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32643.

The product of its digits is 2304, while the sum is 29.

The square root of 213183281 is about 14600.7972727519. The cubic root of 213183281 is about 597.3805072577.

The spelling of 213183281 in words is "two hundred thirteen million, one hundred eighty-three thousand, two hundred eighty-one".