216530613 has 12 divisors (see below), whose sum is σ = 336825580. Its totient is φ = 133249536.

The previous prime is 216530609. The next prime is 216530641. The reversal of 216530613 is 316035612.

216530613 is a `hidden beast` number, since 2 + 1 + 653 + 0 + 6 + 1 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 145009764 + 71520849 = 12042^2 + 8457^2 .

It is not a de Polignac number, because 216530613 - 2² = 216530609 is a prime.

It is a super-3 number, since 3×216530613³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216530653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 925228 + ... + 925461.

Almost surely, 2^216530613 is an apocalyptic number.

It is an amenable number.

216530613 is a deficient number, since it is larger than the sum of its proper divisors (120294967).

216530613 is a wasteful number, since it uses less digits than its factorization.

216530613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1850708 (or 1850705 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 216530613 is about 14714.9792048783. The cubic root of 216530613 is about 600.4909065750.

The spelling of 216530613 in words is "two hundred sixteen million, five hundred thirty thousand, six hundred thirteen".