216711001 has 4 divisors (see below), whose sum is σ = 233381092. Its totient is φ = 200040912.

The previous prime is 216710999. The next prime is 216711041. The reversal of 216711001 is 100117612.

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 36614601 + 180096400 = 6051^2 + 13420^2 .

It is a cyclic number.

It is not a de Polignac number, because 216711001 - 2¹ = 216710999 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216711001.

It is not an unprimeable number, because it can be changed into a prime (216711041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8335026 + ... + 8335051.

It is an arithmetic number, because the mean of its divisors is an integer number (58345273).

Almost surely, 2^216711001 is an apocalyptic number.

It is an amenable number.

216711001 is a deficient number, since it is larger than the sum of its proper divisors (16670091).

216711001 is a wasteful number, since it uses less digits than its factorization.

216711001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16670090.

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 216711001 is about 14721.1073292738. The cubic root of 216711001 is about 600.6576132373.

Adding to 216711001 its reverse (100117612), we get a palindrome (316828613).

The spelling of 216711001 in words is "two hundred sixteen million, seven hundred eleven thousand, one".