216883181 has 2 divisors, whose sum is σ = 216883182. Its totient is φ = 216883180.

The previous prime is 216883111. The next prime is 216883201. The reversal of 216883181 is 181388612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137851081 + 79032100 = 11741^2 + 8890^2 .

It is a cyclic number.

It is not a de Polignac number, because 216883181 - 2²² = 212688877 is a prime.

It is a super-2 number, since 2×216883181² = 94076628401357522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216883111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108441590 + 108441591.

It is an arithmetic number, because the mean of its divisors is an integer number (108441591).

Almost surely, 2^216883181 is an apocalyptic number.

It is an amenable number.

216883181 is a deficient number, since it is larger than the sum of its proper divisors (1).

216883181 is an equidigital number, since it uses as much as digits as its factorization.

216883181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 38.

The square root of 216883181 is about 14726.9542336493. The cubic root of 216883181 is about 600.8166481572.

The spelling of 216883181 in words is "two hundred sixteen million, eight hundred eighty-three thousand, one hundred eighty-one".