216516739 has 4 divisors (see below), whose sum is σ = 221552056. Its totient is φ = 211481424.

The previous prime is 216516691. The next prime is 216516757. The reversal of 216516739 is 937615612.

216516739 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.

It is a cyclic number.

It is not a de Polignac number, because 216516739 - 2²¹ = 214419587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216516239) 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, 2517594 + ... + 2517679.

It is an arithmetic number, because the mean of its divisors is an integer number (55388014).

Almost surely, 2^216516739 is an apocalyptic number.

216516739 is a deficient number, since it is larger than the sum of its proper divisors (5035317).

216516739 is an equidigital number, since it uses as much as digits as its factorization.

216516739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5035316.

The product of its digits is 68040, while the sum is 40.

The square root of 216516739 is about 14714.5077729430. The cubic root of 216516739 is about 600.4780810001.

The spelling of 216516739 in words is "two hundred sixteen million, five hundred sixteen thousand, seven hundred thirty-nine".