216891699 has 32 divisors (see below), whose sum is σ = 306561024. Its totient is φ = 136244640.

The previous prime is 216891683. The next prime is 216891721. The reversal of 216891699 is 996198612.

216891699 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216891699 - 2⁴ = 216891683 is a prime.

It is a super-3 number, since 3×216891699³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (216891659) 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, 503014 + ... + 503444.

It is an arithmetic number, because the mean of its divisors is an integer number (9580032).

Almost surely, 2^216891699 is an apocalyptic number.

216891699 is a deficient number, since it is larger than the sum of its proper divisors (89669325).

216891699 is a wasteful number, since it uses less digits than its factorization.

216891699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607.

The product of its digits is 419904, while the sum is 51.

The square root of 216891699 is about 14727.2434284220. The cubic root of 216891699 is about 600.8245136652.

The spelling of 216891699 in words is "two hundred sixteen million, eight hundred ninety-one thousand, six hundred ninety-nine".