216491259 has 16 divisors (see below), whose sum is σ = 304312320. Its totient is φ = 136697280.

The previous prime is 216491239. The next prime is 216491309. The reversal of 216491259 is 952194612.

It is not a de Polignac number, because 216491259 - 2⁵ = 216491227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216491239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20394 + ... + 29135.

It is an arithmetic number, because the mean of its divisors is an integer number (19019520).

Almost surely, 2^216491259 is an apocalyptic number.

216491259 is a deficient number, since it is larger than the sum of its proper divisors (87821061).

216491259 is a wasteful number, since it uses less digits than its factorization.

216491259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49610.

The product of its digits is 38880, while the sum is 39.

The square root of 216491259 is about 14713.6419352926. The cubic root of 216491259 is about 600.4545250358.

The spelling of 216491259 in words is "two hundred sixteen million, four hundred ninety-one thousand, two hundred fifty-nine".