209016481 has 2 divisors, whose sum is σ = 209016482. Its totient is φ = 209016480.

The previous prime is 209016463. The next prime is 209016503. The reversal of 209016481 is 184610902.

It is a happy number.

209016481 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., 206899456 + 2117025 = 14384^2 + 1455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209016481 is a prime.

It is a super-2 number, since 2×209016481² = 87375778659246722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (209016781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104508240 + 104508241.

It is an arithmetic number, because the mean of its divisors is an integer number (104508241).

Almost surely, 2^209016481 is an apocalyptic number.

It is an amenable number.

209016481 is a deficient number, since it is larger than the sum of its proper divisors (1).

209016481 is an equidigital number, since it uses as much as digits as its factorization.

209016481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 209016481 is about 14457.4022908682. The cubic root of 209016481 is about 593.4628126787.

The spelling of 209016481 in words is "two hundred nine million, sixteen thousand, four hundred eighty-one".