216164047 has 4 divisors (see below), whose sum is σ = 235815336. Its totient is φ = 196512760.

The previous prime is 216164021. The next prime is 216164071. The reversal of 216164047 is 740461612.

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

It is a cyclic number.

It is not a de Polignac number, because 216164047 - 2¹¹ = 216161999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216164077) 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, 9825628 + ... + 9825649.

It is an arithmetic number, because the mean of its divisors is an integer number (58953834).

Almost surely, 2^216164047 is an apocalyptic number.

216164047 is a deficient number, since it is larger than the sum of its proper divisors (19651289).

216164047 is a wasteful number, since it uses less digits than its factorization.

216164047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19651288.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 216164047 is about 14702.5183897181. The cubic root of 216164047 is about 600.1518569329.

The spelling of 216164047 in words is "two hundred sixteen million, one hundred sixty-four thousand, forty-seven".