216460281 has 4 divisors (see below), whose sum is σ = 288613712. Its totient is φ = 144306852.

The previous prime is 216460267. The next prime is 216460297. The reversal of 216460281 is 182064612.

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 not a de Polignac number, because 216460281 - 2²³ = 208071673 is a prime.

It is a super-2 number, since 2×216460281² = 93710106501197922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216460261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36076711 + ... + 36076716.

It is an arithmetic number, because the mean of its divisors is an integer number (72153428).

Almost surely, 2^216460281 is an apocalyptic number.

It is an amenable number.

216460281 is a deficient number, since it is larger than the sum of its proper divisors (72153431).

216460281 is an equidigital number, since it uses as much as digits as its factorization.

216460281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72153430.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 216460281 is about 14712.5892010890. The cubic root of 216460281 is about 600.4258837446.

The spelling of 216460281 in words is "two hundred sixteen million, four hundred sixty thousand, two hundred eighty-one".