216155671 has 4 divisors (see below), whose sum is σ = 216185112. Its totient is φ = 216126232.

The previous prime is 216155657. The next prime is 216155713. The reversal of 216155671 is 176551612.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 216155671 - 2⁷ = 216155543 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 (216155171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6276 + ... + 21718.

It is an arithmetic number, because the mean of its divisors is an integer number (54046278).

Almost surely, 2^216155671 is an apocalyptic number.

216155671 is a deficient number, since it is larger than the sum of its proper divisors (29441).

216155671 is a wasteful number, since it uses less digits than its factorization.

216155671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29440.

The product of its digits is 12600, while the sum is 34.

The square root of 216155671 is about 14702.2335377996. The cubic root of 216155671 is about 600.1441052015.

The spelling of 216155671 in words is "two hundred sixteen million, one hundred fifty-five thousand, six hundred seventy-one".