216435481 has 2 divisors, whose sum is σ = 216435482. Its totient is φ = 216435480.

The previous prime is 216435467. The next prime is 216435529. The reversal of 216435481 is 184534612.

216435481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122655625 + 93779856 = 11075^2 + 9684^2 .

It is a cyclic number.

It is not a de Polignac number, because 216435481 - 2⁹ = 216434969 is a prime.

It is a super-2 number, since 2×216435481² = 93688634871402722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216435781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108217740 + 108217741.

It is an arithmetic number, because the mean of its divisors is an integer number (108217741).

Almost surely, 2^216435481 is an apocalyptic number.

It is an amenable number.

216435481 is a deficient number, since it is larger than the sum of its proper divisors (1).

216435481 is an equidigital number, since it uses as much as digits as its factorization.

216435481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 34.

The square root of 216435481 is about 14711.7463613264. The cubic root of 216435481 is about 600.4029524697.

It can be divided in two parts, 216435 and 481, that multiplied together give a triangular number (104105235 = T₁₄₄₂₉).

The spelling of 216435481 in words is "two hundred sixteen million, four hundred thirty-five thousand, four hundred eighty-one".