216701881 has 4 divisors (see below), whose sum is σ = 236402064. Its totient is φ = 197001700.

The previous prime is 216701813. The next prime is 216701899. The reversal of 216701881 is 188107612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216701881 - 2⁷ = 216701753 is a prime.

It is a super-2 number, since 2×216701881² = 93919410457876322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216701081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9850075 + ... + 9850096.

It is an arithmetic number, because the mean of its divisors is an integer number (59100516).

Almost surely, 2^216701881 is an apocalyptic number.

It is an amenable number.

216701881 is a deficient number, since it is larger than the sum of its proper divisors (19700183).

216701881 is a wasteful number, since it uses less digits than its factorization.

216701881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19700182.

The product of its (nonzero) digits is 5376, while the sum is 34.

The square root of 216701881 is about 14720.7975667081. The cubic root of 216701881 is about 600.6491871549.

The spelling of 216701881 in words is "two hundred sixteen million, seven hundred one thousand, eight hundred eighty-one".