213530531 has 8 divisors (see below), whose sum is σ = 227478720. Its totient is φ = 199853352.

The previous prime is 213530521. The next prime is 213530533. The reversal of 213530531 is 135035312.

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-213530531 is a prime.

It is a super-2 number, since 2×213530531² = 91190575338283922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213530497 and 213530506.

It is not an unprimeable number, because it can be changed into a prime (213530533) 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, 66125 + ... + 69278.

It is an arithmetic number, because the mean of its divisors is an integer number (28434840).

Almost surely, 2^213530531 is an apocalyptic number.

213530531 is a deficient number, since it is larger than the sum of its proper divisors (13948189).

213530531 is a wasteful number, since it uses less digits than its factorization.

213530531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135505.

The product of its (nonzero) digits is 1350, while the sum is 23.

The square root of 213530531 is about 14612.6839081669. The cubic root of 213530531 is about 597.7046850421.

Adding to 213530531 its reverse (135035312), we get a palindrome (348565843).

The spelling of 213530531 in words is "two hundred thirteen million, five hundred thirty thousand, five hundred thirty-one".