216145449 has 16 divisors (see below), whose sum is σ = 344848000. Its totient is φ = 133012368.

The previous prime is 216145427. The next prime is 216145469. The reversal of 216145449 is 944541612.

216145449 is a `hidden beast` number, since 2 + 161 + 454 + 49 = 666.

It is not a de Polignac number, because 216145449 - 2¹¹ = 216143401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216145469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307549 + ... + 308250.

It is an arithmetic number, because the mean of its divisors is an integer number (21553000).

Almost surely, 2^216145449 is an apocalyptic number.

It is an amenable number.

216145449 is a deficient number, since it is larger than the sum of its proper divisors (128702551).

216145449 is a wasteful number, since it uses less digits than its factorization.

216145449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615821 (or 615815 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 216145449 is about 14701.8858994348. The cubic root of 216145449 is about 600.1346447824.

The spelling of 216145449 in words is "two hundred sixteen million, one hundred forty-five thousand, four hundred forty-nine".