213563481 has 8 divisors (see below), whose sum is σ = 285496320. Its totient is φ = 142003152.

The previous prime is 213563479. The next prime is 213563491. The reversal of 213563481 is 184365312.

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

It is not a de Polignac number, because 213563481 - 2¹ = 213563479 is a prime.

It is a super-2 number, since 2×213563481² = 91218720833674722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213563461) 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, 91786 + ... + 94083.

It is an arithmetic number, because the mean of its divisors is an integer number (35687040).

Almost surely, 2^213563481 is an apocalyptic number.

It is an amenable number.

213563481 is a deficient number, since it is larger than the sum of its proper divisors (71932839).

213563481 is a wasteful number, since it uses less digits than its factorization.

213563481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186255.

The product of its digits is 17280, while the sum is 33.

The square root of 213563481 is about 14613.8113098534. The cubic root of 213563481 is about 597.7354274943.

The spelling of 213563481 in words is "two hundred thirteen million, five hundred sixty-three thousand, four hundred eighty-one".