216307345 has 4 divisors (see below), whose sum is σ = 259568820. Its totient is φ = 173045872.

The previous prime is 216307319. The next prime is 216307397. The reversal of 216307345 is 543703612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 126607504 + 89699841 = 11252^2 + 9471^2 .

It is a cyclic number.

It is not a de Polignac number, because 216307345 - 2¹⁵ = 216274577 is a prime.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 21630730 + ... + 21630739.

It is an arithmetic number, because the mean of its divisors is an integer number (64892205).

Almost surely, 2^216307345 is an apocalyptic number.

It is an amenable number.

216307345 is a deficient number, since it is larger than the sum of its proper divisors (43261475).

216307345 is an equidigital number, since it uses as much as digits as its factorization.

216307345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43261474.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 216307345 is about 14707.3908291036. The cubic root of 216307345 is about 600.2844438352.

The spelling of 216307345 in words is "two hundred sixteen million, three hundred seven thousand, three hundred forty-five".