216136289 has 4 divisors (see below), whose sum is σ = 216840624. Its totient is φ = 215431956.

The previous prime is 216136259. The next prime is 216136303. The reversal of 216136289 is 982631612.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 216136289 - 2¹² = 216132193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216136259) 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, 351707 + ... + 352320.

It is an arithmetic number, because the mean of its divisors is an integer number (54210156).

Almost surely, 2^216136289 is an apocalyptic number.

It is an amenable number.

216136289 is a deficient number, since it is larger than the sum of its proper divisors (704335).

216136289 is an equidigital number, since it uses as much as digits as its factorization.

216136289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704334.

The product of its digits is 31104, while the sum is 38.

The square root of 216136289 is about 14701.5743714746. The cubic root of 216136289 is about 600.1261669865.

The spelling of 216136289 in words is "two hundred sixteen million, one hundred thirty-six thousand, two hundred eighty-nine".