216079581 has 8 divisors (see below), whose sum is σ = 288212800. Its totient is φ = 143999712.

The previous prime is 216079561. The next prime is 216079597. The reversal of 216079581 is 185970612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216079581 - 2¹⁵ = 216046813 is a prime.

It is a super-2 number, since 2×216079581² = 93380770650271122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216079541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2665 + ... + 20958.

It is an arithmetic number, because the mean of its divisors is an integer number (36026600).

Almost surely, 2^216079581 is an apocalyptic number.

It is an amenable number.

216079581 is a deficient number, since it is larger than the sum of its proper divisors (72133219).

216079581 is a wasteful number, since it uses less digits than its factorization.

216079581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26675.

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 216079581 is about 14699.6456079730. The cubic root of 216079581 is about 600.0736770636.

The spelling of 216079581 in words is "two hundred sixteen million, seventy-nine thousand, five hundred eighty-one".