216703145 has 4 divisors (see below), whose sum is σ = 260043780. Its totient is φ = 173362512.

The previous prime is 216703133. The next prime is 216703153. The reversal of 216703145 is 541307612.

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 25240576 + 191462569 = 5024^2 + 13837^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216703145 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, 21670310 + ... + 21670319.

It is an arithmetic number, because the mean of its divisors is an integer number (65010945).

Almost surely, 2^216703145 is an apocalyptic number.

It is an amenable number.

216703145 is a deficient number, since it is larger than the sum of its proper divisors (43340635).

216703145 is an equidigital number, since it uses as much as digits as its factorization.

216703145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43340634.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 216703145 is about 14720.8404991019. The cubic root of 216703145 is about 600.6503549945.

The spelling of 216703145 in words is "two hundred sixteen million, seven hundred three thousand, one hundred forty-five".