216846129 has 4 divisors (see below), whose sum is σ = 289128176. Its totient is φ = 144564084.

The previous prime is 216846083. The next prime is 216846131. The reversal of 216846129 is 921648612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 216846129 - 2¹⁵ = 216813361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216866129) 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, 36141019 + ... + 36141024.

It is an arithmetic number, because the mean of its divisors is an integer number (72282044).

Almost surely, 2^216846129 is an apocalyptic number.

It is an amenable number.

216846129 is a deficient number, since it is larger than the sum of its proper divisors (72282047).

216846129 is an equidigital number, since it uses as much as digits as its factorization.

216846129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72282046.

The product of its digits is 41472, while the sum is 39.

The square root of 216846129 is about 14725.6962144409. The cubic root of 216846129 is about 600.7824320012.

The spelling of 216846129 in words is "two hundred sixteen million, eight hundred forty-six thousand, one hundred twenty-nine".