216453481 has 4 divisors (see below), whose sum is σ = 216898432. Its totient is φ = 216008532.

The previous prime is 216453449. The next prime is 216453493. The reversal of 216453481 is 184354612.

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 a cyclic number.

It is not a de Polignac number, because 216453481 - 2⁵ = 216453449 is a prime.

It is a super-2 number, since 2×216453481² = 93704218874034722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216553481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221745 + ... + 222718.

It is an arithmetic number, because the mean of its divisors is an integer number (54224608).

Almost surely, 2^216453481 is an apocalyptic number.

It is an amenable number.

216453481 is a deficient number, since it is larger than the sum of its proper divisors (444951).

216453481 is an equidigital number, since it uses as much as digits as its factorization.

216453481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444950.

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

The square root of 216453481 is about 14712.3581046683. The cubic root of 216453481 is about 600.4195963113.

The spelling of 216453481 in words is "two hundred sixteen million, four hundred fifty-three thousand, four hundred eighty-one".