216245507 has 4 divisors (see below), whose sum is σ = 216290136. Its totient is φ = 216200880.

The previous prime is 216245467. The next prime is 216245509. The reversal of 216245507 is 705542612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216245507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216245509) 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 3 ways as a sum of consecutive naturals, for example, 14018 + ... + 25079.

It is an arithmetic number, because the mean of its divisors is an integer number (54072534).

Almost surely, 2^216245507 is an apocalyptic number.

216245507 is a deficient number, since it is larger than the sum of its proper divisors (44629).

216245507 is an equidigital number, since it uses as much as digits as its factorization.

216245507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44628.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 216245507 is about 14705.2884024762. The cubic root of 216245507 is about 600.2272352257.

The spelling of 216245507 in words is "two hundred sixteen million, two hundred forty-five thousand, five hundred seven".