216291829 has 4 divisors (see below), whose sum is σ = 232929676. Its totient is φ = 199653984.

The previous prime is 216291821. The next prime is 216291847. The reversal of 216291829 is 928192612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 134026929 + 82264900 = 11577^2 + 9070^2 .

It is a cyclic number.

It is not a de Polignac number, because 216291829 - 2³ = 216291821 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216291791 and 216291800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216291821) 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, 8318904 + ... + 8318929.

It is an arithmetic number, because the mean of its divisors is an integer number (58232419).

Almost surely, 2^216291829 is an apocalyptic number.

It is an amenable number.

216291829 is a deficient number, since it is larger than the sum of its proper divisors (16637847).

216291829 is a wasteful number, since it uses less digits than its factorization.

216291829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16637846.

The product of its digits is 31104, while the sum is 40.

The square root of 216291829 is about 14706.8633297519. The cubic root of 216291829 is about 600.2700904374.

The spelling of 216291829 in words is "two hundred sixteen million, two hundred ninety-one thousand, eight hundred twenty-nine".