213530545 has 4 divisors (see below), whose sum is σ = 256236660. Its totient is φ = 170824432.

The previous prime is 213530533. The next prime is 213530593. The reversal of 213530545 is 545035312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 88962624 + 124567921 = 9432^2 + 11161^2 .

It is a cyclic number.

It is not a de Polignac number, because 213530545 - 2²¹ = 211433393 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21353050 + ... + 21353059.

It is an arithmetic number, because the mean of its divisors is an integer number (64059165).

Almost surely, 2^213530545 is an apocalyptic number.

It is an amenable number.

213530545 is a deficient number, since it is larger than the sum of its proper divisors (42706115).

213530545 is an equidigital number, since it uses as much as digits as its factorization.

213530545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42706114.

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 213530545 is about 14612.6843872028. The cubic root of 213530545 is about 597.7046981048.

Adding to 213530545 its reverse (545035312), we get a palindrome (758565857).

The spelling of 213530545 in words is "two hundred thirteen million, five hundred thirty thousand, five hundred forty-five".