216715499 has 32 divisors (see below), whose sum is σ = 303657984. Its totient is φ = 149086080.

The previous prime is 216715489. The next prime is 216715519. The reversal of 216715499 is 994517612.

It is not a de Polignac number, because 216715499 - 2⁸ = 216715243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216715409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18317 + ... + 27729.

It is an arithmetic number, because the mean of its divisors is an integer number (9489312).

Almost surely, 2^216715499 is an apocalyptic number.

216715499 is a deficient number, since it is larger than the sum of its proper divisors (86942485).

216715499 is a wasteful number, since it uses less digits than its factorization.

216715499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9467.

The product of its digits is 136080, while the sum is 44.

The square root of 216715499 is about 14721.2601023146. The cubic root of 216715499 is about 600.6617689089.

The spelling of 216715499 in words is "two hundred sixteen million, seven hundred fifteen thousand, four hundred ninety-nine".