216455313 has 4 divisors (see below), whose sum is σ = 288607088. Its totient is φ = 144303540.

The previous prime is 216455303. The next prime is 216455341. The reversal of 216455313 is 313554612.

216455313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 216455313 - 2²² = 212261009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216455303) 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, 36075883 + ... + 36075888.

It is an arithmetic number, because the mean of its divisors is an integer number (72151772).

Almost surely, 2^216455313 is an apocalyptic number.

It is an amenable number.

216455313 is a deficient number, since it is larger than the sum of its proper divisors (72151775).

216455313 is an equidigital number, since it uses as much as digits as its factorization.

216455313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72151774.

The product of its digits is 10800, while the sum is 30.

The square root of 216455313 is about 14712.4203651201. The cubic root of 216455313 is about 600.4212902328.

The spelling of 216455313 in words is "two hundred sixteen million, four hundred fifty-five thousand, three hundred thirteen".