216964181 has 16 divisors (see below), whose sum is σ = 254448000. Its totient is φ = 181160448.

The previous prime is 216964171. The next prime is 216964193. The reversal of 216964181 is 181469612.

It is not a de Polignac number, because 216964181 - 2¹⁸ = 216702037 is a prime.

It is a super-2 number, since 2×216964181² = 94146911674001522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216964141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44345 + ... + 48993.

It is an arithmetic number, because the mean of its divisors is an integer number (15903000).

Almost surely, 2^216964181 is an apocalyptic number.

It is an amenable number.

216964181 is a deficient number, since it is larger than the sum of its proper divisors (37483819).

216964181 is a wasteful number, since it uses less digits than its factorization.

216964181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4828.

The product of its digits is 20736, while the sum is 38.

The square root of 216964181 is about 14729.7040364021. The cubic root of 216964181 is about 600.8914351017.

The spelling of 216964181 in words is "two hundred sixteen million, nine hundred sixty-four thousand, one hundred eighty-one".